A train running at certain speed crosses a stationary engine in 20 sec – McqOptions

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1.	A train running at certain speed crosses a stationary engine in 20 seconds. To find out the speed of the train, which of the following information is necessary ?
A.	Both the length of the train and the length of the engine
B.	Only the length of the train
C.	Only the length of the engine
D.	Either the length of the train or the length of the engine
Answer» B. Only the length of the train

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