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?
Choose the correct answer:  A) 180  B) 90  C) 270  D) 360  E) None of the above
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   180nswer = (180)
<result>A</result>
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?