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# Aptitude - Time and Distance - Discussion

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"Hold a true friend with both hands."
- (Proverb)
1.

A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?

 [A]. 3.6 [B]. 7.2 [C]. 8.4 [D]. 10

Explanation:

 Speed = 600 m/sec. 5 x 60

= 2 m/sec.

Converting m/sec to km/hr (see important formulas section)

 = 2 x 18 km/hr 5

= 7.2 km/hr.

 Abhi said: (Thu, Jun 3, 2010 06:21:19 AM) What's the formula?

 Shikha said: (Sat, Jun 5, 2010 04:02:44 AM) From where you got 18, I don't understand.

 Sundar said: (Sat, Jun 5, 2010 07:47:01 AM) Hi Abhi & Shika, Kindly go through the basic formulas for solving Time and Distance problems. Have a nice day!

 Rajasekaran said: (Fri, Jun 18, 2010 07:29:33 AM) How that 18 came?

 Mallikarjun said: (Fri, Jul 2, 2010 01:29:12 AM) 1km/hr=(1ooo/3600)m/s=(5/18)m/s for converting m/s into km/hr 18/5 is required to use

 Yuvaraj said: (Fri, Jul 9, 2010 04:56:34 AM) I don't know the formula. How you convert m to km. What s that formula.

 Sushree said: (Fri, Jul 16, 2010 08:25:47 AM) Where we got 60 there?

 Mohit said: (Sun, Jul 18, 2010 09:26:58 AM) Before attempting questions kindly go through the formulas.

 Deepa said: (Wed, Jul 21, 2010 01:32:05 AM) Can anybody explain me the step 2.

 Piyush said: (Fri, Jul 23, 2010 01:31:28 AM) In step 2. There is conversion of m/sec to km/hr.

 Vidu said: (Wed, Aug 4, 2010 06:28:14 AM) From where the 60 came?

 Sundar said: (Wed, Aug 4, 2010 06:41:47 AM) Hi Vidu and Sushree, You questions is from where did 60 come? Please concentrate on the unit name mentioned along with the numbers. Speed = Distance/Time Here Distance = 600 meters and Time = 5 mins. Therefore, Speed = 600/5 meters/minutes. We have to write it as in terms of meters/seconds. So we are multiplying it with 60 (1 min = 60 seconds). So, Speed = 600/(5 x 60 sec) meters/seconds. I strongly suggest all newbies to go through the basic formulas before posting your doubts here. So, kindly go through the basic formulas for solving Time and Distance problems. Have a nice day!

 Shilpa said: (Thu, Sep 2, 2010 02:56:13 AM) Hi Sundar,. All these days I wat getting why we should multiply with 60. Your explaination regarding that 60 is going to be useful for me. Your expalination was clean and clear. Thank you so much.

 Abdul Hafeez said: (Mon, Oct 11, 2010 05:12:37 AM) Are engg entrance exam questions enough for clearing aptitude test?.

 Jashwa said: (Mon, Dec 20, 2010 05:13:24 AM) Why did you invert 5/18 into 18/5?

 Jashwa-Marine said: (Tue, Dec 28, 2010 07:57:57 AM) I didn't get why does change 5/18 into 18/5.

 Jayan said: (Wed, Jan 5, 2011 10:38:33 PM) I am very confused, How came 18?

 Digant said: (Thu, Jan 6, 2011 03:16:50 AM) Forget this above mentioned method one man cover 600 m in 5 min thn in 60 min (1 hour)how much he cover ( 60 x 600 ) / 5 = 7200 m = 7200 / 1000 = 7.2 km / hour 1 km = 1000 m

 Sundar said: (Wed, Jan 19, 2011 06:01:58 AM) Thank you.

 Deepa.Pk said: (Fri, Jan 28, 2011 01:40:38 PM) @jayan,jashwa to convert km/hr to m/sec, we hav to do in dis way..... 1km=1000m 1hr=3600sec 1km/hr=1000/3600 m/sec therefore 1km/hr=5/18 m/sec similarly to convert m/sec, we hav to in reverse way..... 1000m=1km ---> m=1/1000km 3600sec=1hr ---> sec=1/3600hr its just a normal cross multiplication m/sec=3600/1000 km/hr therefore m/sec=18/5 km/hr its not necessary to do al these steps. i included al the steps just for your better understanding......... hope u can understand now thank u

 Ravi S said: (Sat, Jan 29, 2011 10:13:30 AM) Just formula s=d/t =600/5*60m/sec

 Sheela M B said: (Mon, Mar 28, 2011 03:33:20 PM) To: Digant, Deepak. Pk, Sundar and Ravi S Great guys. All of you have helped freshers in every best possible way to learn through... And freshers need not panic, go through all suggestions and sure you shall end up with happy results. & its an enlightning that you never forget your basics.

 Gokul said: (Wed, Apr 13, 2011 05:22:51 AM) s=d/t =600/5*60 =600/300 =2m/s 1km=1000m 1/1000km=1m 3600s=1hr 1/3600=1s 2*3600/1000=7.2km/hr

 Prajweetha said: (Tue, May 3, 2011 05:35:32 AM) T=5 Min, 5*60=300sec SPEED=DISTANCE/TIME =600/300 =2m/s convert m/s to km/sec by formula 2*18/5 =36/5 =7.2km/hr

 Kavitha said: (Wed, May 4, 2011 12:59:43 AM) Thank you sundar your explanation is realy good.

 Sidd said: (Mon, May 9, 2011 02:24:13 AM) For 600m 5 min. thn for 60min .... km => 600/5*60= 2m/sec convert to km so for 1 hr 3600sec and 1000m = 1km 3600*2/1000=7.2km

 Avinash said: (Sun, May 22, 2011 08:34:30 AM) speed=distance/time so the given distance is 600m and time is 5 mins..for this we have to convert minutes into seconds..5*60=300 seconds. speed=(600*300)m/sec=2m/sec bt in answer they given in km/hr so we have to change m/sec in km/hr speed=(2*18/5)km/hr=7.2 km

 Yahiya said: (Fri, May 27, 2011 12:07:32 AM) Yeah I understand the gokul explanation.

 Abinaya said: (Mon, Jul 4, 2011 04:29:44 AM) Thankyou prajweetha. Your explanation is really good.

 Supriya said: (Thu, Jul 7, 2011 10:37:18 PM) Thank you so much, you people have explained it well.

 Vino said: (Wed, Sep 7, 2011 11:20:30 AM) And onething before attempting the answers. We should study the formulas. Hence it is given in Important formulas. We must calculate using by mentioned formulas.

 Vinoth said: (Fri, Sep 30, 2011 01:06:47 PM) A person is running at a speed of 18km/hr After one min a bomb blasts . Sound travels at 330m/s. How long does the man run before he cud he hear the sound?? How to solve this question?

 Seshu said: (Wed, Oct 5, 2011 10:00:05 AM) In above problem clearly given that for 5 minutes travelled distance is 600 mtrs.multiplied with 12 on both sides then we get one hour travelled distance i.e. 12*5mnts is 12*600mts = 7.2 km.

 Vijay said: (Fri, Oct 14, 2011 01:18:44 PM) Please, dear. Not understand the conversion of the m/sec to km/sec. Please tell me brifely.

 Ganesh said: (Wed, Mar 7, 2012 10:42:49 PM) To convert km/hr to m/sec, we hav to do in dis way..... 1km=1000m 1hr=3600sec 1km/hr=1000/3600 m/sec therefore 1km/hr=5/18 m/sec Similarly to convert m/sec, we hav to in reverse way..... 1000m=1km ---> m=1/1000km 3600sec=1hr ---> sec=1/3600hr its just a normal cross multiplication m/sec=3600/1000 km/hr therefore m/sec=18/5 km/hr

 Riyazahmad said: (Thu, Mar 22, 2012 10:57:53 AM) Its simple, no need to go through 18/5. do one thing, 1st convert m/s into km/hr i.e. (2m/s=2*3600/(1000)) after doing this calculation you will get {7.2 km/hr}

 Ravichandran said: (Fri, Apr 20, 2012 09:34:33 AM) 600=5minutes therefore 120= 1 minute 60*120=7200 meters Kilometer per hour = 7.2 Thats all

 Priya said: (Thu, May 10, 2012 01:21:10 PM) Why we convert 5 min into seconds?

 Swayam said: (Wed, Jun 20, 2012 07:58:23 AM) @Priya. Our question is why we convert 5 min into seconds. Its because of the formula i.e. if speed of the body is 'a'm/sec then when we convert it into km/sec, it becomes (a*18/5) km/sec. In both cases time is required in sec. So it is necessary to convert 5 min into sec. Ok ?

 Sandip said: (Thu, Aug 16, 2012 11:16:07 AM) Simply, One man cover 600 m in 5 minute first calculation wht is dist cover for 1 minute 600mtr/5min = 120meter is cover per(1) minute qus is find the km/perhour 1hour=60minute 120mtr*60minute = 7200meter is cover in 1hour(60minute) find km 1000meter=1km =7200/1000=7.2 km/perhour

 Dinen said: (Thu, Sep 27, 2012 01:53:00 AM) Very simple, In 5 mins he covers 600 m. In 1 min he will cover 600/5. In 60 mins he will cover (600*60) /5 = 7200 m i.e. 7. 2 km.

 Ravi Saini said: (Thu, Oct 18, 2012 05:30:54 PM) In 1 km -1000 m 1 hr.-60 min. 1 min.-60 sec. So, 1 hr.-3600 sec. metre\hour to k.m\sec. To do it, 3600.metr\1000.sec. Now divide 3600 to 1000, we get 18\5.

 Manoj said: (Sat, Dec 29, 2012 09:18:16 AM) 600 mtr in 5 minutes so 1 km = 1000 mtr (600/5=120 mtrs per minute) so 1 hour = 60 minutes so (60*120=7200 mtrs) Here (7200/1000)= 7.2 km/hr.

 Sekhar said: (Sat, Jan 19, 2013 04:22:57 PM) t=5 Mins, 5*60=300sec(1min=60 sec) SPEED=DISTANCE/TIME =600/300 =2m/s. Convert m/s to km/sec by formula 2*18/5 =36/5 =7.2km/hr.

 Rajwindr Singh said: (Thu, Apr 11, 2013 10:39:53 AM) Answer: Option B. Explanation: Distance = 600 m. Time = 5 min. Speed = 600/5 = 120m/min or 120*60/1000 = 7.2km/hr.