Previous Year Questions

Part of the tank filled by pipe A in an hour = 1/32

Part of the tank filled by pipe B in an hour = 1/28

Part fill by A and B in 2 hours = 1/32 + 1/28 = 15/224

Part filled in 14*2 hours = 14*15/224

Part filled in 28 hours = 210/224

Remaining Part = 1- 210/224 = 14/224 = 1/16

Part of the tank filled by pipe A in 2 hours = 2*1/32 = 1/16

Hence, total time = 28 + 2 = 30 hours