Question

B. Two pipes p and q can fill an in 15 minutes and 20 minutes respectively, while the third pipe can empty the cistern in 30mins. If the three pipes are opened at a time. How long it will take to empty the tank? a) 12hrs b) 13hrs c) 10hrs d) 11hrs​

Answer 1

Answer:

according to question

it's incomplete but

Step-by-step explanation:

according to question answer is 10hrs

Answer 2

Answer:

B. Two pipes p and q can fill an in 15 minutes and 20 minutes respectively, while the third pipe can empty the cistern in 30mins. If the three pipes are opened at a time. How long it will take to empty the tank? a) 12hrs b) 13hrs c) 10hrs

Answer is c) 10 hours