Question

John and sam have a lawn mowing service. at one home, john can mow the lawn by himself in 3 hours, but it takes sam 3.5 hours. how many hours t will it take them to mow the same lawn together? give the answer correct to one decimal place

Answer 1

1/3+1/3.5=6.5/10.5
1/(6.5/10.5)=10.5/6.5 hours=1.65384 hours to mow the lawn working together
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Answer 2

The number of hours, t it will take them to mow the same lawn together correct to one decimal place is 0.6 hour

Given:

Hours John spent = 3 hours

Hours Sam spent = 3.5 hours

Total time it takes them to mow the same lawn together, t = 1/Hours John spent + 1/Hours Sam spent

t = 1/3 + 1/3.5

t = (3.5+3) / 10.5

= 6.5/10.5

= 0.6190476190476 hours

Approximately to one decimal place = 0.6 hour

Therefore, number of hours, t it will take them to mow the same lawn together correct to one decimal place is 0.6 hour

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