Kevin drove from A to B at a constant speed of 70 mph. Once he reached B, he turned right around with pause, and returned to A at a constant speed of 90 mph. Exactly 3 hours before the end of his trip, he was still approaching B, only 70 miles away from it. What is the distance between A and B?
","rationale_html":"In the last 70 miles of his approach to B, Kevin was traveling at 70 mph, so he traveled that distance in 1 hr, or 60 minutes. That means, when he arrived at B, 60 minutes had elapsed, and he took (3 hr) – (1 hr) = 2 hr to drive the distance D at 90 mph.
D = RT = (90 mph)[ (2 hr] = 180 mi
Answer = (A)
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","ord":3},{"label":"E","content_html":"None of the above
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