SEPTEMBER 1, 2010
A hiker can average two miles per hour uphill and six miles per hour downhill. Going uphill and down, and if he spends no time at the summit,
What will be his average speed for an entire trip?
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If it takes twice as long for a passenger train to pass a freight train after it first overtakes it as it takes the two trains to pass when going in opposite directions.
How many times faster than the
freight train is the passenger train?
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