Give a quick stream of consciousness before answering the following question. A car traveled from San Diego to San Francisco at an average speed of 45 miles per hour. If the journey back took twice as long, what was the average speed of the trip?\nOptions:\n(A) 30.\n(B) 32.\n(C) 36.\n(D) 42.\n(E) 44.
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Let the time taken be = x\nOne way distance = 45x\nTotal distance traveled = 2 * 45x = 90x\nTotal time taken = x + 2x = 3x\nAverage speed = 90x/3x = 30
The answer: (A).
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