A train running at a c

Question

A train running at a certain speed crosses another train running in the opposite direction in 4.8 seconds. to find out the speed of the first train , which of the following information P and Q is sufficient ?

P : Then length of the first train Q : The length of the second train

Options:

A . only P is sufficient

B . only Q is sufficient

C . either P or Q is sufficient

D . Both P and Q are needed

E . Both P and Q are not sufficient

Answer: Option E

Let two trains of lengths a and b metres be moving in opposite directions at u m /s and v m/s

Time taken by he trains to cross each other = `(a + b)/(u + v)` sec

`:.` `(a + b)/(u + v)` = 4.8

In order to find u, we must know a, b and v,

i.e. , length of first train , length of second rain and the speed of the second train .

Thus , P and Q are not sufficient .

`:.` The correct answer is (E) .

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