alleryA boat covers 24 km downstream in 2 hours and the same 24 km upstream in 3 hours. What is the speed of the stream?
A$1$ km/h
B$2$ km/h
C$3$ km/h
D$4$ km/h
Answer & Solution
Correct answer: B. $2$ km/h
Downstream speed = 24/2 = 12 km/h.
Upstream speed = 24/3 = 8 km/h.
Stream speed = (down − up)/2 = (12 − 8)/2 = 2 km/h.
Boat speed = (down + up)/2 = 10 km/h.
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