Posted by **Robert** on Wednesday, March 7, 2012 at 12:30pm.

Mr Jones takes 4 hours to paint a fence.

Mark his son takes 6 hours to paint the same fence.

How long does it take for them both to paint the fence?

- Maths -
**Steve**, Wednesday, March 7, 2012 at 12:48pm
In one hour,

dad paints 1/4 fence

son paints 1/6 fence

together they paint 5/12 fence

so, they paint a whole fence in 12/5 hours, or 2 hrs 24 min

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