book Maths Puzzle Numerical Ability

Two workers can trim 400 meters of hedge in 10 hours. how long will it take 5 workers to trim 600 meters of hedge?
______hours.

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book Other Question

Subtract. Reduce answer to simplest form.

(2)/(5w + 10) minus (3)/(2w - 4)

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Solve the equation for the indicated variable:

y^2-ay+10by-10ab=0 for y