Question

A pipe can fill a tank in 12 hours. By mistake, a waste pipe at the bottom is left
opened and the tank is filled in 16 hours. If the tank is full, how much time will the
waste pipe take to empty it?
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Answer 1

Answer:

capcity of A fill in one hour 4 liter/hour

capicity of A+B fill in one hour 3 liter/hour

now water emties power of b 1 liter/hour

total capcity of tank LCM of 12 &16 =48 liter

if B empties tank 1 liter in 1 hour then 48 liter empties in 48 hour