Quantitative Aptitude • Time, Speed & WorkMedium
A boat moves at 6 km/h in still water and the stream flows at 1 km/h. How long will the boat take to go 35 km downstream and come back?
A. 11.67 hours
B. 5 hours
C. 7 hours
D. 12 hours✓ Correct Answer
💡 Solution & Explanation
Downstream the stream helps: 6 + 1 = 7 km/h, so going takes 35 ÷ 7 = 5 hours. Upstream the stream works against it: 6 − 1 = 5 km/h, so coming back takes 35 ÷ 5 = 7 hours. Total time = 12 hours.
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