SOLUTION: If Mary and Bob cleans a room in 10 hours and Mary takes 15 hours to do it alone. How long will Bob take to clean the same room. Thank you

Question 825488: If Mary and Bob cleans a room in 10 hours and Mary takes 15 hours to do it alone. How long will Bob take to clean the same room. Thank you

Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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rates:
x = mary
y = bob
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x + y = 1/10
x = 1/15
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x + y = 1/10
1/15 + y = 1/10
y = 1/10 - 1/15
y = 15/150 - 10/150
y = 5/150
y = 1/30
---
answer:
time = 1/r
1/y = 30 hours
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