exam Maths Puzzle Numerical Ability

FIND THE SLOPE OF ANY LINE PERPENDICULAR TO THE LINE THROUGHT POINTS (0,5) AND (-3, -4)

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one watering system needs about 3 times as long to complete a job as another watering system.when both systems operate at the same time,the job can be completed in 9 mins.how long does it take each systemto do the job alone? Find the solutions to: -|x|<0

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