At 12pm, ship A is 150km west of ship B. Ship A is sailing west at 35km/h and ship B is sailing north at 25km/h. How fast is the distance between ships changing at 4:00 pm.
Just lost on this question, not sure if its because im tired or what. I know the formula that will have to be diffrentiated is pythagorean theorem, and that we are looking for the d(hypotenuse)/dt

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Find da/dt and db/dt
Then apply Pythagoras' theorem for dz/dt

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