Sam can mow a lawn in 20 min, while takes 10 min longer to mow the same lawn. How long will they take to mow the lawn if they work together?
Created: 5 years ago |
Updated: 3 years ago
best des
In 1 minute, Sam mows 1/20 of the lawn
In 1 minute, Mark mows 1/(20 + 10) = 1/30 of the lawn
(1/20 + 1/30) = 5/60 = 1/12 of the lawn takes 1 minute
So, whole(1) lawn takes 12 minutes
Md Azizur Rahman
Founder of Satt
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