Question

You can mow one acre in 126 minutes. i can mow one acre in 117 minutes. how long will it take you to mow a 0.17-acre lawn? 13 incorrect: your answer is incorrect. minutes how long will it make me to mow the same lawn? 17 incorrect: your answer is incorrect. minutes if we mow the lawn together, how long will it take us? 30 incorrect: your answer is incorrect. minutes

Answer 1

a) (0.17 ac)×(126 min/ac) = 21.42 min

b) I can mow 1/126 ac/min; you can mow 1/117 ac/min. Together, we can mow at a rate that is the sum of these:

... (1/126 + 1/117) ac/min = (117 + 126)/(126×117) = 243/14,742 ac/min

Then it will take 14,742/243 min/ac × 0.17 ac/lawn ≈ 10.31 min/lawn