Problema Solution
By checking work records, a plumber finds that Raul can plumb a house in 48 hr. Mira can do the same job in 36 hr. How long would it take if they worked together?
Answer provided by our tutors
Hi,
Raul can plumb a house in 48hr. Mira can do the same job in 36hr
Let x represent the time it would take together.
Amount done per hr is the equalizer
1/48 + 1 / 36 = 1/x Multiplying each term by 144x so as all denominators = 1
144x/48 + 144x/36 = 144x/x
3x + 4x = 144
7x = 144
x = 20.57 hrs is the time it takes working to gether ro plumb the house