Question

A water tank has two inlets and one outlet. if the inlets fill the tank in 30 and 45 minutes respectively and the outlet empties it in 30 minutes , how much time will take it to fill the tank if all the inlets and outlets are opened together ​

Answer 1

Answer:

A=30

B=45

C=(-)30

LCM of 30,45,30= 180

A fills in 1 hour = 180/30 = 6L

B " " " "" " " = 180/45 = 4L

C empeties in 1 hour = 180/30 = 6L

A+B+C = 6+4-6 = 4L

Time taken = 180/4 = 45 min

Answer 2

Answer:

A=30

B=45

C=(-)30

LCM of 30,45,30=180

A fills in 1 hours =180/30=6L

B" "" " " =180/45=4L

cempeties in 1 hours =180/30=6L

A+B+C=6+4-6=4L

Time taken= 180/4=45 min