Student: A car traveled from San Diego to San Francisco at an average speed of 48 miles per hour. If the journey back took twice as long, what was the average speed of the trip?\nOptions:\n(A) 24.\n(B) 32.\n(C) 36\n(D) 42.\n(E) 44..
Another student: Let's say, hmmm...

User
Let the time taken be = x\nOne way distance = 48x\nTotal distance traveled = 2 * 48x = 96x\nTotal time taken = x + 2x = 3x\nAverage speed = 96x/3x = 32 Final answer: (B).
Assistant