Distance Formula Word Problems

An aircraft carrier made a trip to Guam and back. The trip there took three hours and the trip back took four hours. It averaged 6km/h on the return trip. Find the average speed of the trip there.
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What is the formula for finding distance and current of a row boat if only the still water rowing speed is given?
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The speed of a current is 6 mph. If a boat travels 62 miles downstream in the same time that it takes to travel 31 miles upstream, what is the speed of the boat in still water?
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Juan drives to work. Becasue of traffic conditions, he averages 22 mph. He returns home averaging 32 mph. The total travel time is 2 1/4 hours. How much time does Juan spend driving to work?

A truck enters the highway traveling 60mph. A car enters the highway 13 minutes later traveling 66 mph. From the time the car enters the highway, how long will it be before the car passes the truck?