SOLUTION: bj can overhaul a boat's engine in 30 hours. his apprentice takes 60 hours to do the same job. how long would it take them to work together assuming no gain or loss in effeincy

SOLUTION: bj can overhaul a boat's engine in 30 hours. his apprentice takes 60 hours to do the same job. how long would it take them to work together assuming no gain or loss in effeincy

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Question 932174: bj can overhaul a boat's engine in 30 hours. his apprentice takes 60 hours to do the same job. how long would it take them to work together assuming no gain or loss in effeincy

Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/a+1/b=1/x
1/30+1/60=1/x
60/1800+30/1800=1/x
90/1800=1/x
x=1800/90
x=20 hours working together
check
x/a+x/b=1
x/30+x/60=1
20/30+20/60=1
0.66666667+0.33333333=1
1=1
ok
codewt

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