- A9 a.m.
- B8:30 a.m.
- C10 a.m.
- D9:30 a.m.
Step-by-Step Solution
Downstream speeds: A 12, B 18 km/h. By 7 a.m. A is 12 km ahead. Gap closes at 6 km/h ⇒ 2 h ⇒ 9 a.m.
Answer: A) 9 a.m.
Launch A (10 km/h in still water) leaves a ghat at 6 a.m. going downstream. Launch B (16 km/h in still water) leaves the same ghat at 7 a.m. in the same direction. The river flows at 2 km/h. At what time does B catch A?
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