Posted by Cassie on Wednesday, November 2, 2011 at 11:35pm.
Runner A is initially 7.0 km west of a flagpole and is running with a constant velocity of 6.5 km/h due east. Runner B is initially 8.0 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?

Physics  drwls, Thursday, November 3, 2011 at 12:24am
The distance between the runners decreases at a rate of 14.0 km/h. Since they are initially 15 km apart, they meet after 15/14 = 1.0714 hours
Runner B will have run 1.0714*7.5 = 8.0357 miles at that time. He ends up 0.0357 miles (189 feet) west of the flagpole. So does Runner A.

Physics  cassie, Thursday, November 3, 2011 at 12:44am
Thank you sooo Much !!!:) i truly appreciate it .
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