# 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
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:
188 comments Page 18 of 19.

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

I am very confused, How came 18?

I didn't get why does change 5/18 into 18/5.

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?.

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.

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!