Question

A tap can fill a tank in 32 minutes and another can empty it in 16 min if the tank is already half full and both the pipes are opended together the tank will be

Answer 1

lets suppose tank has capacity of 32 litre. so per minute filling tap will be putting 1 litre in tank while emptying tank will be taking .5 litre out of tank.

initially we have 16 litre water in tank being half filled.

now per minute efficiency of water in the Tank is 0.5 litre and we need to fill 16 litre so it will take 32 minute complete fill the tank...