A boat covers a distance of 12 km in 1 hour upstream and in 45 minutes downstream. Find the speed of the boat and the stream (in km/h).
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 14; 2.
Upstream speed = 12 km/h
Downstream speed = 12/(45/60) = 16 km/h
Speed of boat = (12 + 16)/2 = 28/2 = 14 km/h
Speed of stream = (16 - 12)/2 = 4/2 = 2 km/h
Therefore, the boat's speed in still water is 14 km/h, and the stream's speed is 2 km/h.