Question

a train 100metres in length crosses a pole in 5 seconds find its speed in kilometre per hour

Answer 1

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Here's your answer.
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Distance covered = 100 m
Time taken = 5s
Speed = Distance ÷ Time
= 100m ÷ 5s
= 20 m/s
Speed (in km/hr) = 20 × 18
= 360
= 360 ÷ 5
= 74 km/hr
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Answer 2

Hey dear your answer is here,
Since its length is 100m and it completely crosses a pole .
So total distance covered in 5sec = 100m or 0.1 km
And total time = 5sec or 0.0013888889 hrs.
So,
Speed = distance ÷ time
Speed = 0.1÷0.0013888889
Speed = 71.99km/hrs (approx.)

Hope it may help you....