Question

Two beauticians, Lydia and Jackie, are working on your hair. Lydia can complete the work in 2 hours, while Jackie can complete the work in 1 hour. How many hours do the beauticians take if they work together?

A. one half
B.three halvess
C.two thirds
D.four thirds

Answer 1

That is not correct. I just took the test and the answer is 2/3

Answer 2

Option C.

Explanation:

Two beauticians Lydia and Jackie are working on your hair.

Lydia takes the time to complete the work = 2 hours

Per hour work done by Lydia = 1/2

Jackie complete the work = 1 hour

In one hour total work done by both Jackie and Lydia together =
`1+(1)/(2)=1(1)/(2)or (3)/(2)`

therefore, time taken by both to complete the work will be =
`(1)/((3)/(2) )` =
`(2)/(3)`

Option C. two thirds is the correct option.