#### If a pipe can fill a cistern in 12 hours and another pipe can fill the same cistern in 15 hours, how long will it take for both the pipes to fill the cistern working together? 1. [ ] 4 hours and 48 minutes 2. [x] 6 hours and 40 minutes 3. [ ] 6 hours and 24 minutes 4. [ ] 7 hours and 15 minutes #### Two pipes A and B can fill a cistern in 30 minutes and 45 minutes respectively. If both the pipes are opened together, then the cistern will be filled in: 1. [ ] 12 minutes and 30 seconds 2. [x] 15 minutes 3. [ ] 18 minutes 4. [ ] 22 minutes and 30 seconds #### Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 8 hours. Pipe A,B and C together can fill the same tank in 12 hours. Then which of the following statements is true for pipe C 1. [ ] It can fill the tank in 4 hours 40 minutes 2. [ ] It can fill the tank in 4 hours 48 minutes 3. [x] It can empty tank in 4 hours 48 minutes 4. [ ] It can empty the tank in 4 hours 40 minutes #### Two water taps togther can fill a tank in 9 3/8 hours.The tap of larger diameter takes 10 hours less than the smaller one to fill the tank seperately . The time in which each tap can seperately fill the tank is respectively 1. [x] 10,20 2. [ ] 15,25 3. [ ] 5, 15 4. [ ] 15,20 #### Two pipes A and B together can fill a tank in 6 hours.If pipe A can fill 5 hours faster than Pipe B, in how many hours pipe B alone can fill the tank? 1. [ ] 12 2. [ ] 10 3. [ ] 18 4. [x] 15