Question

A boy walks at a speed of 4km/h.how much time in second does he take to walk a distance of 20 km​

Answer 1

Explanation:

time=distance/speed

=20/4h

=5h

5h=5×60×60

=18000sec

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Answer 2

Speed of boy in km/h

= 4km/h

Speed of boy in m/s

(1 km = 1000m, 1 hr = 3600 seconds)

=(4×1000)/(1×3600)

= 4000km/3600sec

= 1.1m/s

Distance given in km = 20km

Now,Distance in metre = 20×1000= 20000m

We know, time = distance/speed

Now, time = 20000/1.1

Time = 18000 seconds

Therefore, he will take 18000 seconds.

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