请教TTmath3中两道算不明白的题

Q14: 
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
Answer: 这个算出来的数字怎么也不对

Q18:
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) %
Answer: 没看明白，请教思考方式

Q14我算出来的数字也不在答案里啊，不知道我算的答案跟你一样吗,我的算法是(22/1160)/(45/3600)

Q18 设Stock X 去年初的price是P，去年初的earnings是E，则去年末的price是P(1+k%),earnings是E（1+m%)，本题求的是每股的price和earings比率增加了多少percent，应该是 100*{[P(1+k%):E(1+m%)]/(P:E)-1}%,答案是D