Tony can run a mile twice as fast as Tina, who with a time of 6 minutes is one-third as fast a runner as Tom. What are all three of their mile times when added together? Give me reasons, before answering the question
Since someone running twice as fast a mile as another person would mean they complete the mile in half as much time, this means Tony would run a mile in 6 / 2 = 3 minutes since Tina's time was 6 minutes. Since Tom is three times as fast as Tina, for the same reasons as above this means his time is 6 / 3 = 2 minutes. Altogether then, the total time for all three is then 6 + 3 + 2 = 11 minutes. So the final answer is 11.