Problema Solution
it takes cody 15 minutes to wash a car. it takes ray 10 minutes to wash the same car. if they worked together, how long would it take them?
Answer provided by our tutors
let
x = the number of minuted Cody and Ray need to wash the car together
in 1 minute they will was: 1/x of the car thus their rate is 1/x car per min
it takes cody 15 minutes to wash a car thus his rate is: 1/15 car per min
it takes ray 10 minutes to wash the same car this his rate is: 1/10 car per min
now we have:
1/15 + 1/10 = 1/x
by solving we find:
x = 6 min
click here to see the step by step solution of the equation:
it will take them 6 minutes to wash the car together.