What is the time taken by a boy running at a speed of 20 km/hr to cover a distance 400 meter?
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Answer:First u need to convert the speed of boy from km/hr to m/s
So,
1 km = 1000 m
And, 1hour=3600 seconds.
So, 1 km /hr= 1000/3600
= 5/18 m/sec.
So, 20 km/ hr= 20×5/18 =100/18 m/s.
The distance is given 400 m. And we meet to find Time as given-
Now, put the formula-
Speed (velocity) = Distance/Time
100/18 = 400/Time
Rearranging,
Then, Time =Distance/speed
=400/ (100/18)
= 400×18/100
= 4×18
= 72 seconds.
Explanation:
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