Calculating speed, time, and distance

Every summer Jill drives to Michigan. It is 3900 km away. If she averages 100 km/hr, how much time will she spend driving? Every winter Jill flies home to Michigan. It takes 5 hours. What is her average speed? The fastest train in the world, the TGV from France, travels 800 miles in 2.5 hours. What is the TGV’s speed? ................
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