Quantitative Aptitude • Time, Speed & WorkMedium
A boat moves at 7 km/h in still water and the stream flows at 3 km/h. How long will the boat take to go 60 km downstream and come back?
A. 17.14 hours
B. 21 hours✓ Correct Answer
C. 6 hours
D. 15 hours
💡 Solution & Explanation
Downstream the stream helps: 7 + 3 = 10 km/h, so going takes 60 ÷ 10 = 6 hours. Upstream the stream works against it: 7 − 3 = 4 km/h, so coming back takes 60 ÷ 4 = 15 hours. Total time = 21 hours.
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