Problema Solution
Bob can take his test in 40 minutes while Sally can take her test in 90 minutes how long would it take for the two of them to finish the test if they worked on it together?
Answer provided by our tutors
We will use the general equation (number of tests finished)=(rate)(time). From the given information we can write:
1=B(40)
1=S(90)
1=(B+S)(t)
Where B is the rate of Bob, S is the rate of Sally, and 't' is the time is would take the two of them to finish the test if they worked together. Solving for 't', we get:
t=27.69 minutes