- A30 minutes
- B1 hour
- C15 minutes
- D45 minutes
Step-by-Step Solution
Lake: 9 ÷ 6 = 1.5 h. Upstream speed = 4.5 km/h, so 9 ÷ 4.5 = 2 h. Extra time = 0.5 h = 30 minutes.
Answer: A) 30 minutes
A boatman on Dal Lake (no current) rows at 6 km/h. He now rows on the Jhelum, which flows at 1.5 km/h. How much longer does 9 km take upstream than on the lake?
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