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Working together, Jeff and Ashley painted their apartment in 6 hours. If Jeff had been working alone, he could have pain

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Working together, Jeff and Ashley painted their apartment in 6 hours. If Jeff had been working alone, he could have pain

by BTGmoderatorDC » Sat Jul 25, 2020 6:55 pm

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Working together, Jeff and Ashley painted their apartment in 6 hours. If Jeff had been working alone, he could have painted the whole apartment in 10 hours. How many hours would it have taken Ashley to paint the apartment alone?

A. 4
B. 12
C. 15
D. 16
E. 20


OA C

Source: Princeton Review
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Re: Working together, Jeff and Ashley painted their apartment in 6 hours. If Jeff had been working alone, he could have

by dashingnightmare » Sun Jul 26, 2020 12:08 am
let total unit of work required to paint=60
both can paint in 6 hours, so 10 unit/hr
jeff can paint in 10 hours, so 6 unit/hr
=>ashley does 4 unit/hr
so it will take ashley 60/4hr=15
C is the correct answer
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