Question

a tap can fill an empty in 12hours and a leakage can emty the whole tank in 20 hours .if the tap and the leakage are working simultaneously, how long will take to fill the whole tank

Answer 1

Tab A can empty the full tank in 1 hours is 1 upon 12 and the leakage can empty the full tank in 1 hours is 1 upon 20 hours then we add both the sums and we get the answer