Question

one tap can fill a cistern in 3 hours and the waste pipe can empty the full cistern in 5 hours. In what time will the empty cistern be full, if the tap and the waste pipe are kept open together. Pls explain Me properly...And step by step...pls mention Each And Every Step..This qs is related to work and time

Answer 1

we usually take +ve sign for filling and -ve sign for emptying

1/t=1/3-1/5

=(5-3)/15

=2/15

t=15/2=7(1/2) hrs

Answer 2

here is your answer...
plz mark brainliest