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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 -

    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

  • Maths -

    It takes them 10 hours to complete two fences, so to complete one together, it would take 5 hours

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