Question

a tap can fill a cistern in 8 hours and another tap can empty the full cistern in 16 hours what will be the time taken to fill the cistern if both the taps are opened

Answer 1

1/8 - 1/16 = 1/16
Hope this was helpful..
it's the total time...

Answer 2

Hello!!! ^_^
Here's The Answer:

For this we need to take out the average.

Avg = sum of observations/number of observations.

Sum:
8+16
=> 24

Number Of Observation:
1+1
=> 2

sum of observations/number of observations:
24/2
=> 12

So, 12 hours are needed.

Hope It Helps!!