Solve the following problems.
1. Carlo can paint a room in 6 hours, but Mark needs 4 hours to paint the same room. How long does it take them to paint the room if they work together?
1. Carlo can paint a room in 6 hours, but Mark needs 4 hours to paint the same room. How long does it take them to paint the room if they work together?
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Answer:
2.4 hours or 2 hours and 24 minutes
Given:
Carlo - 6 hours
Mark - 4 hours
Solution:
Get the LCD:
12
Change
and 
into similar fractions:
Add the fractions:
Cross multiply:
Divide:
5x/5= x
12/5= 2.4
Answer:
x = 2.4 wherein x is the time it will take for Carlo and Mark to paint the room if they work together.