A person can walk a certain distance and drive back in 6

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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?

1. 2 h
2. 2¹/₂ h
3. 5¹/₂ h
4. 4 h

Correct Option: A

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.