Lee can mow a lawn in 10 minutes. It takes Ito 60 minutes to mow a lawn of the same size. How long would it take them to mow the lawn if they work together?
A) 35.0 minutes
B) 50 minutes
C) 8.6 minutes
D) 70 minutes

Question

Quizplus · Accepted Answer

Lee's rate is 1 lawn per 10 minutes, and Ito's rate is 1 lawn per 60 minutes. Together, their combined rate is 1/10 + 1/60 = 1/8.57 lawns per minute. Therefore, it would take them approximately 8.6 minutes to mow the lawn together.

Lee Can Mow a Lawn in 10 Minutes