Polygons

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1 Two pipes A and B can fill a tank in 10 hrs and 40 hrs respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

A
8 hours
B
6 hours
C
4 hours
D
2 hours

2 One pipe can fill a tank four 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
144 min
B
180 min
C
126 min
D
114 min

3 A cistern can be filled by a tap in 3 hours while it can be emptied by another tap in 8 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

A
4.8 hr
B
2.4 hr
C
3.6 hr
D
1.8 hr

4 Bucket P has thrice the capacity as bucket Q. It takes 80 turns for bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?

A
30
B
45
C
60
D
80

5 A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?

A
3 hrs 15 min
B
1 hr 30 min
C
3 hrs 45 min
D
2 hr

6 A tap can fill a tank in 6 hours. Once the half the tank is filled, three more similar taps are opened. In how much time the tank will fill completely?

A
3 hrs 30 min
B
3 hrs 45 min
C
4 hrs
D
4 hrs 15 min

7 Two pipes X and Y can fill a tank in 20 and 30 minutes respectively. If we use both the pipes together, then how long will it take to fill the tank?

A
12 min
B
20 min
C
25 min
D
18 min

8 Pipes A, B and C can fill a tank in 30, 60 and 120 minutes respectively. Pipes B and C are kept open for 10 minutes, and then Pipe B is shut while Pipe A is opened. Pipe C is closed 10 minutes before the tank overflows. How long does it take to fill the tank?

A
40 minutes
B
28 minutes
C
30 minutes
D
36 minutes

9 A Cistern is filled by pipe A in 8 hrs and the full Cistern can be leaked out by an exhaust pipe B in 12 hrs. If both the pipes are opened in what time the Cistern is full?

A
12 hrs
B
24 hrs
C
16 hrs
D
32 hrs

10 A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

A
20 hours
B
25 hours
C
35 hours
D
Cannot be determined