Question: A runner and his trainer are standing together on a circular tracks of radius 100 meters.when the trainer gives a signal, the runner starts to

A runner and his trainer are standing together on a circular tracks of radius 100 meters.when the trainer gives a signal, the runner starts to run around the track at a speed of 10 m/s. How fast is the distance between the runner and the trainer increasing when the runner has run 1/4 of the way around the track?

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