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A train takes 20 seconds to cross a pole. It crosses a platform 1000 meters long in 100 seconds. What is the train's speed?
Let the speed of the train be ‘v’ m/s and it’s length be ‘l’
Then
l/v = 20
20v = l
Also,
(l + 1000)/v = 100
=> 100v = 1000 + l
=> Solving both the equations, we get
v = 12.5 m/s and l = 250 m
Hence the length of the train is 250 m and speed = 12.5 m/s
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