- A7.5 minutes
- B6 minutes
- C10 minutes
- D4.5 minutes
Step-by-Step Solution
Her upstream component must cancel the current (1.8 km/h). Across component = √ √5.76 = 2.4 km/h. Time = 0.3 ÷ 2.4 = 0.125 h = 7.5 minutes.
Answer: A) 7.5 minutes
A river is 300 m wide and flows at 1.8 km/h. Leela swims at 3 km/h relative to the water and angles herself upstream so that she lands exactly opposite her starting point. How long does the crossing take?
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