exam Maths Puzzle Numerical Ability

Elliot began the journey at 8am at 40 kilometers per hour. Benita began to chase him at 11 am at 50 kilometers per hour. What time was it when Bernita got within 60 kilometers of Elliot?

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if an object is thrown upward with an initial velocit of 80ft/second, ten its height is after t seconds is given by: h=80t-16t squared.
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