A train running at a c

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Question

A train running at a certain speed crosses a stationary engine in 20 seconds . to fine out the speed of the train which of the following information is necessary ?

Options:

A . Only the length of the train

B . Only the length of the engine

C . Either the length of the train or the length of the engine

D . Both the length of the train or the length of the engine

Answer: Option D

Time taken by the train o cross a stationary engine
= (Length of train + Length of engine ) /( Speed of the train )
`rArr ` (Length of train + Length of engine ) /( Speed of the train ) = 20 ( given)
Hence , to find the speed of the train , the length of the train and the length of the engine both must be known.
`:.` The correct answer is (D).

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