- A7 min 48 s
- B6 min
- C9 min
- D8 min 20 s
Step-by-Step Solution
Kabir: 0.6/2 + 0.6/4 = 0.45 h = 27 min. Dev: 0.6/3 + 0.6/5 = 0.32 h = 19 min 12 s. Difference = 7 min 48 s.
Answer: A) 7 min 48 s
Swimmers Kabir (3 km/h in still water) and Dev (4 km/h) race from a pier to a buoy 600 m upstream and back. The current is 1 km/h. By how much does Dev win?
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