Question
A white bus left Town E for Town F at the same time when a green bus left Town F to Town E. The average speed of the white bus and the green bus were 70 km/h and 77 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 white bus left Town E for Town F at the same time when a green bus left Town F to Town E. The average speed of the white bus and the green bus were 70 km/h and 77 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?