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April 21, 2014

April 21, 2014

Posted by **bob dylan** on Friday, March 26, 2010 at 7:21pm.

- math -
**Reiny**, Friday, March 26, 2010 at 8:24pmLet the time past noon be t hours

Distance, since noon, travelled by the westbound ship is 16t nautical miles, and ship B is 17t nautical miles.

Let D be the distance between them

D^2 = (16t)^2 + (17t)^2

D^2= 545t^2

D = (√545)t

dD/dt = √545

notice that dD/dt is a constant and independent of the time

So the distance between them is constantly changing at √545 knots or 23.35 knots

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