Madhya Pradesh Police Exam Model Paper 7

Given:
The first tap can fill it in 4 hours and the second tap can empty it in 16 hours
Concept:
If a tap can fill a tank in x hours, then the tank filled by the tap in 1 hour = 1/x of the total tank.
Calculation:
Part of the pot filled by both the taps in 1 hours =

1

4

−

1

16

⇒

4−1

16

=

3

16

Time =(16/3) hours =5

1

3

hours
∴ The required time is 5

1

3

hours.