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Math Question A train travels from Las Vegas to Lancaster in 5 hours at a certain average speed and drives back from Lancaster to Las

Math Question

A train travels from Las Vegas to Lancaster in 5 hours at a certain average speed and drives back from Lancaster to Las Vegas in 4 hours at an average speed 15 miles per hour faster. What is the train's average speed from Las Vegas to Lancaster?

ans: 60mph, 75 mph, 30 mph, 45mph

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