Bob can load his truck in 24 min. It takes his brother John 40 min to load the truck. How long it take them to do the job together?
1/24 - Bob load his truck in 1 min
1/40- John load the truck in 1 min
1/24+1/40= 5/120+3/120=8/120=1/15 - Bob and John load the truck together in 1 min
So it takes 15 minutes to do the job together.
Answer: 15 minutes
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