Problema Solution
it takes a large pump 40 hours to empty a swimming pool,whereas a small pump can empty the pool in 60 hours. how long will it take to empty the pool if both pumps are used?
Answer provided by our tutors
Large pump = 1 / 40 per hour
Small pump = 1 / 60 per hour
Together = 1 / x per hour
1 / 40 + 1 / 60 = 1 / x
1 / 24 = 1 / x
x = 24
So, both of them working together will be 1 / 24 per hour which means that it will take 24 hours for both of them to empty a swimming pool