Question
A train crosses a 500-metre-long platform in 30 seconds,
and the same train crosses a tunnel that is 20% longer than the train itself in 42 seconds. Find the speed of the train in km/h.Solution
Let the length and speed of train be ‘l’ metres and ‘x’ m/s, respectively.
Then, according to question,
(l + 500)/30 = 2.2l/42
42l + 21000 = 66l
24l = 21000
l = 875 metres
x = (l + 500)/30 * (18/5) = 165 km/h
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