book Maths Puzzle Numerical Ability

If Sally can paint a house in 4 hours and John can paint the house in 6 hours. How long will it take them to paint the house together?

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book Other Question

I really didn't saw the topic that I was looking for but my book at the front says Number and Operation Data around us and then number sense. It says on number 18. The table below Are there key factors to observe when solving word problems?