A swimming pool can be filled by valve A in 6 hours and by valve B in 8 hours. When the swimming pool is full, valve C can drain the pull in 7 hours. If the swimming pool is empty, how many hours will it take to fill the pool with all three valves open?
by 
Anonymous
ANSWERS: 1
-
Valve A fills 1/6 of the pool per hour Valve B fills 1/8 of the pool per hour Valve C drains 1/7 of the pool per hour Therefore, the pool fills 1/6 + 1/8 - 1/7 of the pool per hour. The reciprocal of the resulting fraction is the number of hours it will take to fill the pool.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC