Question
David and Shiyun left Town R for Town S at the same time. When David reached Town S in 3 hours, Shiyun had only completed 57 of the distance between the two towns. Shiyun's speed was 20 km/h slower than David. What was David's speed?
5 m

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David and Shiyun left Town R for Town S at the same time. When David reached Town S in 3 hours, Shiyun had only completed 57 of the distance between the two towns. Shiyun's speed was 20 km/h slower than David. What was David's speed?