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A boat goes 24 km downstream in 3 hours and 18 km upstream in 3 hours. Speed of boat in still water:
A6 km/h
B7 km/h
C8 km/h
D5 km/h
Answer & Solution
Correct answer: B. 7 km/h
1. Downstream speed = 24/3 = 8 km/h.
2. Upstream speed = 18/3 = 6 km/h.
3. Boat speed = (8 + 6)/2 = 7 km/h.
_Source: jkchrome TSD QB, p.3 — boats and streams_
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