Amusements In MathematicsLocomotion and Speed Puzzles"The race is not to the swift." -- Ecclesiastes ix. II. In a recent motor ride it was found that we had gone at the rate of ten miles an hour, but we did the return journey over the same route, owing to the roads being more clear of traffic, at fifteen miles an hour. What was our average speed? Do not be too hasty in your answer to this simple little question, or it is pretty certain that you will be wrong. |