The upstream speed of a boat is 8 km/h and the downstream speed is 15 km/h. What is the speed of the boat in still water and the speed of the stream (in km/h), respectively?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 11.5 and 3.5.
Speed of boat in still water=( Downstream speed + Upstream speed )/2
Speed of boat in still water=(15 + 8) /2 =11.5 km/h
Speed of stream=( Downstream speed - Upstream speed )/2
Speed of stream=(15 - 8) /2 = 3.5 km/h