If the speed of a boat in still water is 20km/hr and the speed of the current is 5km, then the time taken by the boat to travel 100 km with the current is?

A. 2 hours

B. 3 hours

C. 4 hours

D. 7 hours

Answer: Option C

Solution(By Examveda Team)

Relative speed = 20 + 5 = 25 km/hr
Time = $$\frac{{100}}{{25}}$$ = 4 hours