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4. In normal situations, is the minimum speed of the entire United States system of highways 45 km / h or 72 km / h. How far in kilometers, a journey by car when it moves continuously at this speed for 3.3 hours?

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5. The different types of trees of inertia on the part of honor is the slowest mammals on the move. It moves in an average tree sloth with a velocity of 0743 m / s. How long does it take a sloth, which moves at this speed 22,30 m traveling?

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6. The longest section of the trail is located directly across the desolate Nullarbor Plain, between Australian cities of Adelaide and Perth. The tracks extend a disttion of 478 km without a curve. How long is a train in motion, traveling at a constant speed of 97 mph on the length of the runway to be?

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7. The fastest is the Concorde supersonic airliner. How long does it take to travel 6265 kilometers Concord between New York and London, England, on the assumption that the aircraft is moving at a speed of 2150 kmh during the entire trip?