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James and John, working together, can paint a room in 5 hours. If Jude helps James and John paint the room, the three of them can paint the room in 4 hours. What amount of time (in hours) would it take James, working alone, to paint the room?*

Answer :

To solve this problem we have to use inverse proportionality.

2 people can paint the room in 5 hours, 3 can paint it in 4 hours.

2----->5

1------>x

[tex]x=\frac{2\cdot5}{1}=10[/tex]

It will take 10 hours for James to paint the room

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