Question

Quantity
I. Two pipes A and B can fill a tank in 12 minutes and 16 minutes respectively. If both the pipes are opened simultaneously, after how much time should B be closed so that the tank is full in 9 minutes? Quantity
II. Two pipes A and B can fill a tank in 24 minutes and 48 minutes respectively. If both the pipes are opened simultaneously, after how much time should B be closed so that the tank is full in 18 minutes?

Q: Answer-Quantity I. Two pipes A and B can fill a tank in 12 minutes and 16 minutes respectively. If bo...

Quantity I. Let B be closed after x minutes. Let total capacity of tank LCM 12 16 48 L So A 1 min work 4812 4L Bs 1 min work 4816 3L So as per the question, 49 3x 48 or 3x 12 or x 4min Quantity II. Let B be closed after minutes. Let total capacity of tank LCM 24 48 48 L So A 1 min work 4824 2L Bs 1 min work 4848 1L So as per the question, 182 1x 48 or x 12 Hence Quantity I Quantity II