- A54 minutes
- B45 minutes
- C30 minutes
- D1 h 12 min
Step-by-Step Solution
Upstream speeds: X 9, Y 14 km/h. X's lead = km. Gap closes at 5 km/h ⇒ 4.5 ÷ 5 = 0.9 h = 54 minutes.
Answer: A) 54 minutes
Launch X (13 km/h in still water) leaves Patna ghat going upstream. Thirty minutes later launch Y (18 km/h in still water) follows it. The Ganga flows at 4 km/h. How long after starting does Y catch X?
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