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Question
A train went 300 miles from X to Y at an average speed of 80 mph. At what speed did it travel on the way back it its average speed for the whole trip was 100 mph?
120 mph
125 mph
133.33 mph
137.5 mph
ANSWER : 3
Descrption
<p>Total time spent = (300 + 300) / 100 = 6 hours</p> <p>Time spent on departure trip = 300 / 80 = 3.75 hours</p> <p>Time spent on return trip = 6 - 3.75 = 2.25 hours</p> <p>Average speed on return trip = 300 / 2.25 = <strong>133.33 miles per hour.</strong></p>
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