book Maths Puzzle Numerical Ability

Solve the equation for the indicated variable:

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

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book Other Question

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.

Thank You.
in the formula c=sqrt of(2a squared+b squared). a=4 and b=5.my answer was 7.550? is this correct.