Quantitative Aptitude • Time, Speed & WorkMedium
A boat moves at 4 km/h in still water and the stream flows at 2 km/h. How long will the boat take to go 18 km downstream and come back?
A. 9 hours
B. 12 hours✓ Correct Answer
C. 3 hours
D. 13 hours
💡 Solution & Explanation
Downstream the stream helps: 4 + 2 = 6 km/h, so going takes 18 ÷ 6 = 3 hours. Upstream the stream works against it: 4 − 2 = 2 km/h, so coming back takes 18 ÷ 2 = 9 hours. Total time = 12 hours.
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