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2 years ago

13

Laura can finish payroll in 3 hours. it takes ben 5 hours to do the same job. If they work together, how long should it take the

m?

1 answer:

rjkz [21]2 years ago

5 0

Answer:

15/8 hours .................

Step-by-step explanation:

Let L be Laura, and B be Ben. Then:

3L=1

5B=1

Next:

15L=5

15B=3

15(L+B)=5+3=8

15/8 (L+B)=1

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