SOLUTION: A machine can harvest the farm in 15 days working for 8 hours a day. How long will 2 machines take to harvest it if they were used for 10 hours?

Question 1174271: A machine can harvest the farm in 15 days working for 8 hours a day. How long will 2 machines take to harvest it if they were used for 10 hours?
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.

The entire job is   15*8 = 120   machine-hours.

Two machines, working 10 hours per day each, will complete the job in    = 6 days.         ANSWER

Solved.

Answer by greenestamps(13200)   (Show Source): You can put this solution on YOUR website!

15 days with one machine working 8 hours a day.

Using 2 machines instead of 1 multiplies the required number of days by a factor of 1/2.

Working 10 hours a day instead of 8 multiplies the required number of days by a factor of 8/10 = 4/5.

So the number of days required with 2 machines working 10 hours a day is

(15)(1/2)(4/5) = 6

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