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(A)At noon, ship A is 140 km west of ship B. Ship A is sailing east...

(A)At noon, ship A is 140 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is the distance between the ships changing at 4:00 PM?

(b) If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate at which the diameter decreases when the diameter is 9 cm.

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