Question:
A man can row 6 km/h in still water. If the river flows at 2 km/h, how long will it take him to row 16 km upstream?
A man can row 6 km/h in still water. If the river flows at 2 km/h, how long will it take him to row 16 km upstream?
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For upstream, subtract river speed from boat speed to find effective speed.
Updated On: Jul 29, 2025
- 2 hours
- 3 hours
- 4 hours
- 5 hours
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The Correct Option is C
Solution and Explanation
- Step 1: Man's speed in still water = 6 km/h, river speed = 2 km/h.
- Step 2: Upstream speed = $6 - 2 = 4$ km/h.
- Step 3: Distance = 16 km. Time = $\frac{16}{4} = 4$ hours.
- Step 4: Verify: At 4 km/h, 16 km takes $16 \div 4 = 4$ hours.
- Step 5: Check options: Option (3) is 4 hours, correct.
- Step 2: Upstream speed = $6 - 2 = 4$ km/h.
- Step 3: Distance = 16 km. Time = $\frac{16}{4} = 4$ hours.
- Step 4: Verify: At 4 km/h, 16 km takes $16 \div 4 = 4$ hours.
- Step 5: Check options: Option (3) is 4 hours, correct.
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