NIFT PG 2013 Question Paper with solutions

Question : 52 of 150

Marks: +1, -0

Two men A and B walk from P to Q at a distance of 21 km at rates 3 and 4 km an hour, respectively. B reaches Q and returns immediately and meets A at R. The distance from P to R is

14 km
20 km
16 km
18 km

Validate

Solution:

Let distance PR = x km
Time of travel of two men A and B are equal.

x/3={21+(21-x)}/4

4x=3(42-x)

4x=126-3x

⇒7x=126

x=126/7=18

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