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OpenStudy (anonymous):
A boat leaves a dock at noon and heads at a speed of 25km/h. Another boat heads north at 20km/h and reaches the same dock at 1:00pm. When were the boats closest to each other?
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OpenStudy (anonymous):
|dw:1428361631883:dw|
OpenStudy (amistre64):
when they were the same distance from the doc ....
OpenStudy (amistre64):
d^2 = x^2 + y^2 calculus i assume?
OpenStudy (anonymous):
Yes, calculus :(
OpenStudy (amistre64):
take the derivative of the formula what do we get?
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