14. How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards) A. 8 B. 9 C. 10 D. 11 E. 12 我算了半天，怎么也对不上答案。我的思路是把45miles/hours转化成yards/second的形式，最后好像是14.5yard/sec。这样的话答案中就没有符合的了。不知道错在哪里？ 18. Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m. By what percent did the ratio of price per share to earnings per share increase, in terms of k and m? A. k/m % B. (k-m) % C. [100(k-m)]/(100+k) % D. [100(k-m)]/(100+m) % E. [100(k-m)]/(100+k+m) % 正确答案是D。我能理解大致意思，但是不太清楚具体的思路，而且此题的最后一句读起来也很绕，请指点！ | 
