Related Rates of Ships

Northbound ship A leaves the harbour at 10:00 with a speed of 12km/h. Westbound ship B leaves the same harbour at 10:30 with a speed of 16km/h.

(a) How fast are the ships separating at 11:30?

(b) When is their rate of separation 18.86 km/h

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...hese two ships equals to Sqrt(Va*Va+Vb*Vb) where Va/Vb is the speed of ship A/B. Since both ships move with constant speed, therefore this relative speed is also a constant, ...