问题描述：
两道英文智力测试题~
1.which letter is very useful to a deaf woman?
2.three girls A,B and C run in a 100m race.when A finishes ,B is 10m behind A an when B finishes,C is 20m behind B.how far in meters is C from A finishes?(let's assume all the athletes run at a constant speed.)
1.which letter is very useful to a deaf woman?
2.three girls A,B and C run in a 100m race.when A finishes ,B is 10m behind A an when B finishes,C is 20m behind B.how far in meters is C from A finishes?(let's assume all the athletes run at a constant speed.)
问题解答：
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