A boat goes 16 km downstream in 2 hours and 16 km upstream in 4 hours. What is the speed of the boat in still water?
A4 km/h
B6 km/h
C8 km/h
D10 km/h
Explanation
Downstream speed (u) = 16/2 = 8 km/h. Upstream speed (v) = 16/4 = 4 km/h. Speed in still water = (u + v)/2 = (8 + 4)/2 = 6 km/h.
Exam Relevance
- Topic: Speed, Time & Distance
- Subtopic: Boats and Streams
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