Answers

2016-05-21T14:10:45+08:00
If you're looking for the speed, refer to the problem itslef. But, if you're referring to the distance between them.

 90^{2}  120^{2}  H^{2}

8100 + 14400= 
 H^{2}

22500 = 
 H^{2}

150 = H
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