Question
A yellow bus left Town R for Town S at the same time when a pink bus left Town S to Town R. The average speed of the yellow bus and the pink 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 yellow bus left Town R for Town S at the same time when a pink bus left Town S to Town R. The average speed of the yellow bus and the pink 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?