Correct Answer - Option 4 : 6 hr 40 minutes
Given
Time taken by Akash for one side walk and return in car = 4 hours 40 minutes
Time can be saved if he had ridden in car both ways = 2 hours 40 minutes
Formula Used
Distance = speed × time
Calculation
1 way car journey takes = (4 hours 40 minutes) – (2 hours 40 minutes)
⇒ 1 hours 20 minutes
So, 1 way walk should take = (4 hours 40 minutes) – (1 hour 20 minutes)
⇒ 3 hour 20 minutes
Both way walk would take = 2 × time taken in 1 way walk
⇒ 2 × (3 hour 20 minutes)
⇒ 6 hour 40 minutes
∴ Time taken by Akash if he walks both ways is 6 hour 40 minutes.