lilithnorton
Answered

Working together, Melissa and Jing can mow a lawn in 5 hours. It would take Melissa 8 hours to do the job alone.



What is the value of r, the part of the lawn that Jing could complete in 1 hour?


0.075

0.125

0.375

0.625

Working together, Melissa and Jing can mow a lawn in 5 hours. It would take Melissa 8 hours to do the job alone. What is the value of r, the part of the lawn th class=

Verified Answer :

Cat1215

Melissa-M
Jing-J
M-8h can finish the job so then in one hour she can finish 1/8
J-x hour can finish the job so than in one hour he can finish 1/x
(1/8 + 1/x) 5 = 100%
5/8 + 5/x = 1 
5/x = 1- 5/8 = 3/8
1/x = 3/81/5
1/x = 3/40 = 0.075
So r=0.075

christieholic2017

The correct answer would be: A.

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