It takes 1.5 hours for Tim to mow the lawn. Linda can mow the same lawn in 2 hours. How long will it take John and Linda, work together, to mow the lawn?  Choose the correct choice from the following answers:
A) 51.1 minutes	B) 51.3 minutes	C) 51.5 minutes	D) 51.7 minutes	E) 51.9 minutes
We first calculate the rate of work of John and Linda   John: 1 / 1.5 and Linda 1 / 2   Let t be the time for John and Linda to mow the Lawn. The work done by John alone is given by   t * (1 / 1.5)   The work done by Linda alone is given by   t * (1 / 2)   When the two work together, their work will be added. Hence   t * (1 / 1.5) + t * (1 / 2) = 1   Multiply all terms by 6   6 (t * (1 / 1.5) + t * (1 / 2) ) = 6   and simplify   4 t + 3 t = 6   Solve for t   t = 6 / 7 hours = 51.5 minutes.   Answer 51.5 minutes
<result>C</result>
It takes 1.5 hours for Tim to mow the lawn. Linda can mow the same lawn in 2 hours. How long will it take John and Linda, work together, to mow the lawn?