Runner a is initially 57 km west of a flagpole and is, Ask an Expert

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Runner A is initially 5.7 km west of a flagpole and is running with a constant velocity of 8.3 km/h due east. Runner B is initially 4.9 km east of the flagpole and is running with a constant velocity of 7.5 km/h due west. How far are the runners from the flagpole when their paths cross?

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