Question

A train 280 M long and running at the speed of 42 km per hour how much time it will take to pass a man standing on a platform

Answer 1

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SPEED = DISTANCE / TIME
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SO TIME = DISTANCE / SPEED

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But first we have 2 convert 280 m in km

And 1km=100m

SO

280m = (280/100)km
=2.8km

Then Apply the fromula

TIME = 2.8 /42

so speed = 0.06km/h

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