| Question | Three pipes A, B and C can fill a cistern in 8 minutes,12 minutes and 16 minutes respectively. What is the time taken by three pipes to fill the cistern when they are opened together? | |
| Type | multiple_choice | |
| Option | 3.7 minutes | correct |
| Option | 4 minutes | incorrect |
| Option | 4.5 minutes | incorrect |
| Option | 5 minutes | incorrect |
Part of the tank filled by A in one minute = 1/8
Part of the tank filled by B in one minute = 1/12
Part of the tank filled by C in one minute = 1/16
Net part of the tank filled by A+B+C in one minute;
= 1/8 + 1/12 + 1/16
13/48 Part of the cistern is filled in one minute.
∴ The whole tank will be filled in 48/13 3.7 minutes
