SOLUTION: water from tank is being used for irrigation at the same time that the tank is being filled.the inlet pipe can fill the tank in 80 hours .the two outlet pipes can drain it in 8 and

Question 755342: water from tank is being used for irrigation at the same time that the tank is being filled.the inlet pipe can fill the tank in 80 hours .the two outlet pipes can drain it in 8 and 4 hours .how long will it take the pipes to drain the tank if all three pipes are operating at the same time .
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add the rate of filling and subtract
the rates of draining
Let = the time in hrs to drain the tank

Note that the right side says that the result is a
rate of draining, not filling
Multiply both sides by

hrs

It will take 2 hrs and 45.6 min to drain the tank

RELATED QUESTIONS
Water from a tank is being used for irrigation while the tank is being filled. The two... (answered by josgarithmetic,MathTherapy)

Water from a tank is being used for irrigation while the tank is being filled. The two... (answered by ikleyn)

A water tank is being filled by two inlet pipes. Pipe A can fill the tank in half the... (answered by lwsshak3)

An inlet pipe can fill a large water tank in 27 minutes. Another inlet pipe can fill... (answered by josgarithmetic)

An inlet pipe can fill a large water tank in 27 minutes. Another inlet pipe can fill the (answered by mananth)

An inlet pipe can fill a large water tank in 27 minutes. Another inlet pipe can fill the (answered by josmiceli)

a water tank is being filled by two inlet pipes. pipe A can fill the tank three times as... (answered by richwmiller)

an inlet pipe can fill a large water tank in 3 hours. an outlet pipe can empty the same... (answered by solver91311)

At A water tank is being filled by water being pumped into the... (answered by richwmiller)