# The changing in distance

Feb 3rd, 2012
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The document solve the problem below in great details: At noon ship A is 150 km west of ship B. Ship A is sailing east at 35km/h and ship B is sailing north at 25km/h. How fast is the distance between the ships changing at 4:00 PM?

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From the giving information we can sketch the position of the two ships as above. Let t be the time (in hours) start from noon, the original position of ship B be the origin O. Then Distance AO = 150-35t, and BO=25t, since AO? BO, use Pythagorean, the distance between AB s = s is a fu

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