Question
Japheth and Emma left Town A for Town B at the same time. When Japheth reached Town B in 4 hours, Emma had only completed 57 of the distance between the two towns. Emma's speed was 20 km/h slower than Japheth. What was Japheth's speed?
5 m

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Japheth and Emma left Town A for Town B at the same time. When Japheth reached Town B in 4 hours, Emma had only completed 57 of the distance between the two towns. Emma's speed was 20 km/h slower than Japheth. What was Japheth's speed?