Posted by **kchik** on Thursday, November 22, 2012 at 12:36am.

A boat sails 30 miles to the east from a point P, then it changes direction and sails to the south. If this boat is sailing at a constant speed of 10 miles/hr, at what rate is its distance from the point P increasing

a) 2 hours after it leaves the point P

b) 7 hours after it leaves the point P

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