Howard L. answered 08/13/14
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Since the distance from Ping's house to Jamal's house is 5 blocks, and its distance which is the same as the return walk home is then 5 blocks. The three properties of Jacob's house, Ping's, Jamal's have two same distance of 5 blocks, and one short distance of 3 blocks. That forms a isosceles triangle with two same sides.