Asked by Anonymous

A mechanic can do a job in 2hr. It takes his assistant 3hr to do the same job how long would it take them to complet the job if they worked together?

Answers

Answered by Reiny
mechanic' rate --- 1/2
assistant's rate --- 1/3
combined rate = 1/2 + 1/3 = 5/6

time at combined rate = 1/(5/6)
= 6/5 hrs
or 1 hour 20 minutes
Answered by Reiny
oops, 1/5 hr = 12 minutes, not 20 minutes

so 1 hour, 12 minutes
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