6.) Two taps can fill a cistem in 10 hours and 8 hours respectively. A

1.	6.) Two taps can fill a cistem in 10 hours and 8 hours respectively. A third tap can empin 15 hours. How long will it take to fill the empty cistem, if all of them are opetogether?
Answer» a+b's 1hr work=1/10+1/8 third tap empty =1/15 of tank When all taps are opened together 1/10+1/8-1/15 of tank = 19/120 1hr =19/120 of tank120/9 hrs = complete tank= 6 6/19 thanks

6.) Two taps can fill a cistem in 10 hours and 8 hours respectively. A third tap can empin 15 hours. How long will it take to fill the empty cistem, if all of them are opetogether?

Answer»

a+b's 1hr work=1/10+1/8

third tap empty =1/15 of tank

When all taps are opened together

1/10+1/8-1/15 of tank = 19/120

1hr =19/120 of tank120/9 hrs = complete tank= 6 6/19

thanks