Pipes & Cisterns

Pipes & Cisterns Worksheet-1

1. Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

(a) 12 min          (b) 15 min          (c) 25 min          (d) 50 min

2. A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

(a) 4.5 hrs          (b) 5 hrs             (c) 6.5 hrs          (d) 7.2 hrs

Pipes & Cisterns Worksheet-2

1. Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

(a) 1 hrs              (b) 2 hrs             (c) 6 hrs             (d) 8 hrs

2. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in:

(a) 81 min          (b) 108 min       (c) 144 min        (d) 192 min

Pipes & Cisterns Worksheet-3

1. Two pipes A and B can fill a cistern in 12 minutes and 15 minutes respectively while a third pipe C can empty the full tank in 6 minutes. A and B are kept open for 5 minutes in the beginning and then C is also opened. In what time is the cistern emptied?

(a) 30 min         (b) 33 min         (c) min     (d) 45 min