11. Two pipes A and B can fill a cistern in1 hour and 75 minutes respe

1.	11. Two pipes A and B can fill a cistern in1 hour and 75 minutes respectively.There is also an outlet C. If all thethree pipes are opened together, thetank is full in 50 minutes. How muchtime will be taken by C to empty thefull tank?(1) 100 minutes (2) 120 minute:(3) 125 minutes(4) Can't be determined(5) of these
Answer» Let the third pipe empty the cistern in x minutes.Part of cistren filled in 1 minute when all three pipes are opened simultaneously 1/60+1/75-1/x= 1/50x= 300/3= 100minOption A

11. Two pipes A and B can fill a cistern in1 hour and 75 minutes respectively.There is also an outlet C. If all thethree pipes are opened together, thetank is full in 50 minutes. How muchtime will be taken by C to empty thefull tank?(1) 100 minutes (2) 120 minute:(3) 125 minutes(4) Can't be determined(5) of these

Answer»

Let the third pipe empty the cistern in x minutes.Part of cistren filled in 1 minute when all three pipes are opened simultaneously

1/60+1/75-1/x= 1/50x= 300/3= 100minOption A