joe and Eric have to ship 75 packages. Joe can do the job alone in 5 hours. if Eric helps, they get it done in 4 hours. How long would it take Eric to do the job alone?
1 answer:
Eric took 20 hours to do the job alone.
<u>Step-by-step explanation </u>:
<u>Given </u>:
Total work = 75 packages Joe took 5 hours to complete the total work. The amount of work Joe alone can do per hour = 75/5 = 15 packages .
The amount of work Joe and Eric together do per hour = 75/4 = 18.75
The amount of work Eric alone can do per hour = 18.75 - 15 = 3.75
The time Eric took to complete the entire work = 75 / 3.75 = 20 hours .
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