Brian, Mark, and Jeff are painting a house. Working together they can paint the house in 6 hours. Working alone, Brian can paint the house in 15 hours, and Jeff can paint the house in 20 hours. How long would it take Mark to paint the house alone?
a.6hours
b.8 hours
c. 7 hours
d.4 hours
solve
¿
Answer:
6 hours
Step-by-step explanation:
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