1. 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: (3)
- 1. 81 min.
- 2. 108 min.
- 3. 144 min.
- 4. 192 min.
2. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half? (4)
- 1. 15 min
- 2. 20 min
- 3. 27.5 min
- 4. 30 min
3. 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? (2)
- 1. 3 hrs 15 min
- 2. 3 hrs 45 min
- 3. 4 hrs
- 4. 4 hrs 15 min
4. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is: (3)
- 1. 10
- 2. 12
- 3. 14
- 4. 16
5. A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is: (3)
- 1. 6 hours
- 2. 10 hours
- 3. 15 hours
- 4. 30 hours