Question

A Boat covers 12 km in 1 h in still water. It takes four times the time in covering the same distance against the current. What is the speed of the current?

• A. 7 km/hr
• B. 8 km/hr
• C. 9 km/hr
• D. 10 km/hr

Answer 1

Answer:

C. 9 km/hr

Speed Upstream = Speed of boat in still water - Speed of current Speed of boat in still water = 12 km/h Speed against the current = 12/4 = 3 km/h Let the speed of the current be x. ⇒ 12 - x = 3 ⇒ x = 9km/h