# Aptitude - Time and Distance - Discussion

Discussion Forum : Time and Distance - General Questions (Q.No. 1)
1.
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
3.6
7.2
8.4
10
Answer: Option
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.

Discussion:
182 comments Page 17 of 19.

Sheela M B said:   1 decade ago
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.

Ravi s said:   1 decade ago
Just formula s=d/t
=600/5*60m/sec

Deepa.pk said:   1 decade ago
@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

Sundar said:   1 decade ago
Thank you.

Digant said:   1 decade ago
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

Jayan said:   1 decade ago
I am very confused, How came 18?

Jashwa-marine said:   1 decade ago
I didn't get why does change 5/18 into 18/5.

Jashwa said:   1 decade ago
Why did you invert 5/18 into 18/5?

Abdul hafeez said:   1 decade ago
Are engg entrance exam questions enough for clearing aptitude test?.

Shilpa said:   1 decade ago
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.

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