309DS: Vickie and Carmen drive the same distance separately, what are the times of Vickie’s driving hours over Carmen’s? 1). Vickie drives 50 miles per hour while Carmen drives 60 miles per hour. 2). The whole distance is 150 miles and Vickie drives 50 miles per hour. 这道题目是a? 条件1只说速度没说路程啊。。。