Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their paths crossed? answer in units of km.

i understand how to set this problem up, a little bit, but I cannot figure out what the final answer is

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