4 men and 10 women can cut a field in 5hrs. If the men work at 5/4 the rate at which the women work. How many men will be needed to cut the field in 3hrs.
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5 women can do the work of 4 men in an hour.
So, the combined crew is the same as having 12 men.
That means that one man can cut 1/60 of the field in an hour.
Now you can see how many men it will take to do the job in 3 hours.