book Maths Puzzle Numerical Ability

Lee and Jesse swam towards each other from opposite sides of a lake that is 3.9 km wide.They began swimming at 2:00 pm and met at 2:30 pm. Lee's speed was 1km/h greater than Jesse'

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can u solve this?
6r^3+7r^2=r
thank you A local chicken farmer is constructing a set of eight pens to cage his chickens as shown in the diagram below. He has decided to use 1200 feet of fencing to create the pens.

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