Data Sufficiency Practice Test 3

Question : 27 of 35

Marks: +1, -0

What is the speed of the train in kmph?
Statement:
I. The train crosses an ‘x’ metre length in ‘n’ seconds.
II. The length of the train is ‘y’ metres.
III. The train crosses a signal pole in ‘m’ seconds.

Any two of the three
Only II and III
Only I and II
All I, II and III
Questions cannot be answered even with information in all the three statements.

Validate

Solution:

Using Statements II and III together:
Length of the train = y meters =

y/1000

km.
The train crosses the signal in m seconds. =

m/{ 60 ×60}

hours.
Speed of the train

= y/1000×3600/m=18/5 y/m

Hence, the solution can be derived by using Statements II and III together.

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