2.99
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At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 4:00 PM?

(a). What quantities are given in the problem?

(b). What is the unknown?

(c). Draw a picture of the situation for any time t.

(d). Write an equation that relates the quantities.

(e). Finish solving the problem.