speaking of math riddles.....how about yesterday's answer:
24 mph.
Most people were quick to answer 25 mph, but this is not correct. Let the distance traveled be 60 miles each way. Then, the trip out = 60/30 = 2 hours, and the trip back = 60/20 = 3 hours. Therefore: the 120 mile trip = 120/5 = 24 mph.