Max can mow a lawn in 45 minutes. Jan takes twice as long to mow the same lawn. If they work together, how long will it take them to mow the lawn?
Mathematics · Middle School · Mon Jan 18 2021
Answered on
Given that
Max mow the lawn in 45 minutes
Jan take twice the time Max takes
∴ Jan mow the lawn in 90 minutes
Now,
Max's one minute work = 1/45
Jan's one minute work = 1/90
If both work together then work done in one minute
= Max's One minute work + Jan's One minute work
= 1/45 + 1/90
= 2/90 + 1/90
= 3/90 or 1/30
In one minute they finish 1/30th part of the work
Time taken to finish whole work by both of them together = 1 ÷ 1/30
= 30 minutes