Question
Riordan and Diana left Town U for Town V at the same time. When Riordan reached Town V in 4 hours, Diana had only completed 58 of the distance between the two towns. Diana's speed was 21 km/h slower than Riordan. What was Riordan's speed?
5 m

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Riordan and Diana left Town U for Town V at the same time. When Riordan reached Town V in 4 hours, Diana had only completed 58 of the distance between the two towns. Diana's speed was 21 km/h slower than Riordan. What was Riordan's speed?