A person can walk a certain distance and drive back in 6 h. He can also walk both ways in 10 h. How much time will he take to drive both ways?

2 h
21/2 h
51/2 h
4 h

Correct Answer: 2 h

Explanation:

Given that, W + D = 6 ...(i)
[ w = Time taken while walking and
D = Time taken while driving ]
From Eq. (i)
5 +D = 6
⇒ D = 1
2D = 2 x 1 = 2
∴ He will take 2 h to drive both ways.

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