A boat travels 32 km upstream and 48 km downstream in 8 hours. If speed of current is 2 km/h, find boat speed in still water.
A8 km/h
B10 km/h
C12 km/h
D14 km/h
Explanation
Let boat speed be v. Upstream speed = v – 2, downstream speed = v + 2. 32/(v-2) + 48/(v+2) = 8. Test v = 10: 32/8 + 48/12 = 4 + 4 = 8 hours. So speed = 10 km/h.
Exam Relevance
- Topic: Speed, Time & Distance
- Subtopic: Boats and Streams
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