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英语翻译Esther drove to work in the morning at an average speed

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英语翻译
Esther drove to work in the morning at an average speed of 45 miles per hour.She returned home in the evening along the same route and averaged 30 miles per hour.If Esther spent a total of one hour commuting to and from work,how many miles did Esther drive to work in the morning?
18miles
某人早上 从家去办公室 45英里/小时车速 晚上回家 一样路线 30英里/小时车速
已知 上下班共花1小时 ,问 家与办公室的距离
s/45+s/30=1