| Question | A pipe can fill a tank in 6 hours and another pipe can empty the tank in 12 hours. If both the pipes are opened at the same time, the tank can be filled in | |
| Type | multiple_choice | |
| Option | 10 hours | incorrect |
| Option | 12 hours | correct |
| Option | 14 hours | incorrect |
| Option | 16 hours | incorrect |
Part of the tank filled in one hour = 1/6
Part of the tank emptied in one hour = 1/12
= 1/6 – 1/12
1/12
Part of the tank can be filled in one hour.
∴ The tank will be filled completely in 12 hours.
Solution 2:Apply formula; =
X = 6 hours and Y = 12 hours
∴
= 12 hours
