Q.Kinley rows a boat from Sarpang to Gelephu, a distance of 36 km. The river current is 3 km/h. His rowing speed in still water is 9 km/h. What is the time taken to go upstream and return?
Solution:
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Upstream speed = 9 − 3 = 6 km/h
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Downstream speed = 9 + 3 = 12 km/h
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Time upstream = 36 ÷ 6 = 6 hrs
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Time downstream = 36 ÷ 12 = 3 hrs
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Total time = 9 hours
Answer: 9 hours
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