Mathematics · Time, Speed and Distance
A boat covers (D + 40) km downstream in 5 hours. In the same amount of time, it covers (D - 20) km upstream. The ratio of the speed of the boat in still water to the speed of the stream is 4:1. Find the total time taken by the boat to cover (D - 20) km downstream and (D - 2) km upstream.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 111 hours
- 210 hours
- 39 hours✓
- 48 hours
Correct answer
9 hours
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