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

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