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英语翻译Julie Ann commutes to work one morning at an average spe

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英语翻译
Julie Ann commutes to work one morning at an average speed of 40 mph.She returns home along the same route at an average speed of 24 mph.If she spends a total of 2 hours traveling to and from work that day,how many miles is her commute to work?
(A) 24 (B) 30 (C) 32 (D) 34 (E) 40
朱丽叶·安有天早上去上班,平均速度为40mph.她下班回家的时候平均速度为24mph.假如她上下班总共花了2小时,那么她上班的路程有多远?
设路程为x,于是有方程
x/40 + x/24 = 2
解得x = 30 miles
故此选C.