Question
Valen and Risa left Town M for Town N at the same time. When Valen reached Town N in 4 hours, Risa had only completed 35 of the distance between the two towns. Risa's speed was 20 km/h slower than Valen. What was Valen's speed?
5 m

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Valen and Risa left Town M for Town N at the same time. When Valen reached Town N in 4 hours, Risa had only completed 35 of the distance between the two towns. Risa's speed was 20 km/h slower than Valen. What was Valen's speed?