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Question

What is the speed of a bullet train A?

I. The relative speed of train A and another train B running in opposite direction is 120 kmph.

II. The train B crosses a signal post in 6.75 seconds.

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Solution

The correct option is **D**

if the data even in both Statements I and II together are not sufficient to answer the question.

Let the two trains of length `x' metres and `y' metres be moving in opposite directions at `u' m/s and `v' m/s.

Then, Statement I gives, u + v = 120.

Statement II gives, v = y6.75 .

From these equations, we cannot obtain `u'.

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