The bus moves with a constant speed of 40 km/h. With what speed does other vehicle have to move in order that the speed of change of distance between them equaled 60 km/h? Find two possible answers on this question: 1) at the movement in the same direction, 2) at the movement in opposite directions. I will illustrate each version of the found response to movements from one point.

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speed of the second tr. means at one-way traffic of 40+60=100 km/h;

speed of the second tr. cf. at the movement in opposite directions of 60-40=20 km/h

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Answer add