Each question is followed by two statements I and II Mark the answer 1 If the questio...........

Math and Mental Ability Data Sufficiency

Each question is followed by two statements, I and II. Mark the answer:

1. If the question can be answered by using one of the statements alone, but cannot be answered using the other statement alone.

2. If the question can be answered by using either statement alone.

3. If the question can be answered by using both statements together, but cannot be answered using either statement alone.

4. If the question cannot be answered even by using both statements together.

What is the speed of the train whose length is 210m?

I. The train crosses another train of 300m length running in opposite direction in 10s.

II. The train crosses another train running in the same direction at the speed of 60kmph in 30s.

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Explanation:

Explanation :
L1 = 210m(Given)
From Statement I, L2 = 300m
L1 + L2 = 210m +300m =510m
S1 + S2 = [D/T] = 510/10 = 51m/s
From Statement II,
S2 = 60kmph = 60*(5/18) = 50/3 m/s
S1 – S2 = 510/30 = 51/3 => S1-50/3 = 51/3
S1 = 101/3 m/s
Thus both the statements are required to answer the question.