1. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is: (3)
- 1. 60 gallons
- 2. 100 gallons
- 3. 120 gallons
- 4. 180 gallons
2. 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? (3)
- 1. 20 hours
- 2. 25 hours
- 3. 35 hours
- 4. Cannot be determined
- 5. None of these
3. 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? (3)
- 1. 1 hour
- 2. 2 hours
- 3 6 hours
- 4 8 hours
4. 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? (1)
- 1. 12 min
- 2. 15 min
- 3. 25 min
- 4. 50 min
5. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank? (4)
- 1. 10 min. 20 sec.
- 2. 11 min. 45 sec.
- 3. 12 min. 30 sec.
- 4. 14 min. 40 sec.
