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Aptitude - Time and Distance - Discussion

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"Act well your part; there all honor lies."
- Alexander Pope
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

Answer: Option E

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.

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