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What average speed will she have

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A person sets out to drive from A to B, a distance of 200 km. She promises her friend at B that she will cover the journey at an average speed of 80 km/h.

Traffic jams slow her down and when she reaches the half way point M she realizes that her average speed so far is 40 m/s. At what average speed will she have to travel from M to B in order to keep her promise?

Reference no: EM131127513

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