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1)At 11AM, a 747 jet is travelling east at 800km/h. At the same instant, a DC-8 is 45km east and 90km north of the 747. It is at the same altitude travelling south at 600km/h. What is the closest distance of approach of the planes, and at what time does it occur?

(answer is 45km; at 11:05AM)

2)A sailor in a boat 8km off a straight coastline wants to reach a point on shore 10km from the point directly opposite her present position in the shortest possible time. Where should she land the boat and how long does it take her to reach her destination if she can row ar 4km/h and run at 6km/h?

(answer is 7.2 km down the shore;3.15h)

Thanx a bunch!!