What was the speed of a running train A I The relative speed of train A and another t...........

Math and Mental Ability Data Sufficiency

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What was the speed of a running train A?

I. The relative speed of train A and another train B running in opposite direction is 160 km/hr

II. The train B crosses a signal post in 9 seconds

The data in statement I alone are sufficient to answer the question.

The data in statement II alone are sufficient to answer the question

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

The data in both the statements I and II together are sufficient to answer the question.

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Explanation:

- Statement I: This gives the relative speed between trains A and B, which is not enough to determine the speed of train A alone without knowing train B's speed.

- Statement II: This provides information on how long train B takes to pass a signal, but without knowing train B's length or speed, we can't find train A's speed.

- Both statements together don't provide enough information to find the speed of train A since neither train B's speed nor any length data is available.

- Option 3 is correct since the information from both statements combined is insufficient to determine train A's speed.