Question
A brown bus left Town C for Town D at the same time when a green bus left Town D to Town C. The average speed of the brown bus and the green bus were 62 km/h and 68 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 brown bus left Town C for Town D at the same time when a green bus left Town D to Town C. The average speed of the brown bus and the green bus were 62 km/h and 68 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?