0 votes

Three friends - A, B and C - go boating in a stream and decide to play a game. B and C are at a point X at time t =0 seconds. B is on a boat which is floating with the stream and C is on a boat which is anchored at X. Both B and C release paper boats at intervals of 5 seconds, beginning at t = 0 seconds. A start from a point Y, downstream of X, at t = 0 seconds and starts collecting all the paper boats he encounters as he rows upstream towards X. The speed of A's boat in still water is thrice the speed of the stream. Find the total number of paper boats collected by A, if B reaches Y at t = 132 seconds.

- 26
- 23
- 24
- 21