Question
A purple bus left Town M for Town N at the same time when a gold bus left Town N to Town M. The average speed of the purple bus and the gold bus were 57 km/h and 78 km/h respectively. The two buses passed each other at a point 21 km from the midway of the two towns. How far apart are these two towns?
3 m

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A purple bus left Town M for Town N at the same time when a gold bus left Town N to Town M. The average speed of the purple bus and the gold bus were 57 km/h and 78 km/h respectively. The two buses passed each other at a point 21 km from the midway of the two towns. How far apart are these two towns?