Question
A black bus left Town N for Town P at the same time when a silver bus left Town P to Town N. The average speed of the black bus and the silver bus were 57 km/h and 71 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 black bus left Town N for Town P at the same time when a silver bus left Town P to Town N. The average speed of the black bus and the silver bus were 57 km/h and 71 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?