Question

Can someone help me answer B and C? I'm really stuck on those 2 questions....

a. Pick a reasonable amount of time in which the three friends can paint the room together. Also pick a reasonable amount of time in which John can paint the room alone and a reasonable amount of time in which Rick can paint the room alone. 8 hours- 3 friends, 12 hours- John, 12 hours- Rick

b. What is the hourly rate for John, Rick, and Molli (when working together)? Use rooms per hour as the unit for your rates.

c. What is the hourly rate for John? What is the hourly rate for Rick? Refer to the amount of time you determined in which John and Rick can paint the room alone. Use rooms per hour as the unit for your rates.

Answer 1

          We know that 3 friends can paint the room together for 8 hours. John can paint it alone for 12 hours and Rick can paint it alone for 12 hours ( Answer a.).
          b. The hourly rate for John, Rick and Molli, when working together is:
          1 /8  ( rooms per hours )
          c. Hourly rate for John: 1 /12.
          Hourly rate for Rick : 1 / 12.
          An equation is: 1/3 = 1/x + 1/12 +1/12 ( 1/x is the hourly rate for Molli, that we don`t know ).