SOLUTION: If 8 workers can plough a 6-hectare fielf in 5 hours, how long will it take to plough a 9-hectare field with 5 workers?

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Question 723508: If 8 workers can plough a 6-hectare fielf in 5 hours, how long will it take to plough a 9-hectare field with 5 workers?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Use rates as number of hectares per hour.

8 workers plough 6/5 hectare per hour. 1 worker has the rate of 6%2F%288%2A5%29 hectare per hour.

The question is about 5 workers. This group goes at the rate of 5%2A%286%2F%288%2A5%29%29 hectare per hour. highlight%285%2A%286%2F%288%2A5%29%29=3%2F4%29 hectare per hour. So for this group to plough 9 hectare,
highlight%289%2F%283%2F4%29=12%29 hours.