bee1538
29.12.2020 •
Mathematics
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 them?
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Ответ:
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
Ответ:
What's the intervals for this question
Step-by-step explanation: