Question
A yellow bus left Town D for Town E at the same time when a purple bus left Town E to Town D. The average speed of the yellow bus and the purple bus were 55 km/h and 69 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 yellow bus left Town D for Town E at the same time when a purple bus left Town E to Town D. The average speed of the yellow bus and the purple bus were 55 km/h and 69 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?