exam Maths Puzzle Numerical Ability

If a woman can mow a lawn in 2 hrs and her husband in 4 hrs how long will it take to mow the lawn if they work together

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exam Other Question

In the graph, B is the point (0,8). The sloping line through B and the horizontal line through C meets at point A.
Find the equation of line AC.
solve for b (5,B2)(2,4b)
m=-1