Question
Download Solution PDFIf Ishwar covers 721 km in a boat in 42 hours against the stream and he takes 15 hours with the stream, then find the speed of the stream.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Distance against stream = 721 km
Time against stream = 42 hours
Distance with stream = 721 km
Time with stream = 15 hours
Formula used:
Speed = Distance ÷ Time
Speed in still water = (Downstream speed + Upstream speed) ÷ 2
Speed of stream = (Downstream speed - Upstream speed) ÷ 2
Calculation:
Upstream speed = 721 ÷ 42 = 17.166 km/h
Downstream speed = 721 ÷ 15 = 48.066 km/h
⇒ Speed of stream = (48.066 - 17.166) ÷ 2
⇒ Speed of stream = 30.9 ÷ 2 = 15.45 km/h
∴ The correct answer is \(15.45\) km/h.
Last updated on Jul 17, 2025
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