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Mathematics 13 Online
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?

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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