Thursday
March 30, 2017

Post a New Question

Posted by on .

Lisa can shovel her drive way in 35 minutes. Tom can shovel the same drive way in 40 minutes. How long will it take them to do the job together?

  • Help - ,

    in one minute, Lisa can shovel 1/35 of the driveway

    in one minute, Tom can shovel 1/40 of the driveway.

    in one minute, they both can shovel 1/35 + 1/40 = 8/280 + 7/280 = 15/280 = 3/56 of the driveway.

    So, it will take them 18 2/3 minutes working together.

    If b is the time for both,

    1/b = 1/35 + 1/40

    b = 35*40/(35+40) = 18 2/3

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question