SOLUTION: Twin brothers Billy and bobby, can mow their grandparents lawn together in 62 minutes. Billy could mow the lawn by himself in 15 minutes less time that it would bobby. How long wou

Question 974548: Twin brothers Billy and bobby, can mow their grandparents lawn together in 62 minutes. Billy could mow the lawn by himself in 15 minutes less time that it would bobby. How long would it take bobby to mow the lawn by himself?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
RT=J relating rate, time, amount of job or jobs.
Rate of combined agents is the sum of their rates.

PERSON___________RATE(LAWNSperMINUTES)
Billy____________1/(x-15)
Bobby____________1/x
Both_____________1/62

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