A man can row upstream at 12km/hr and downstream at 18 km/hr. The man rowing speed in still water is?

A. 15 km/hr

B. 5 km/hr

C. 3 km/hr

D. 10 km/hr

Answer: Option A

Solution(By Examveda Team)

Speed of boat in still water = $$\frac{{x + y}}{2}$$
Where (x = downstream speed) and (y = upstream speed)
∴ Boat's speed
$$\eqalign{ & {\text{ = }}\frac{{18 + 12}}{2} \cr & = \frac{{30}}{2} \cr & = 15\,km/hr \cr} $$