# Two skiers run one after the other: one at a speed of 10 km / h, the other at a speed of 12 km / h.

May 29, 2021 | education

| **Two skiers run one after the other: one at a speed of 10 km / h, the other at a speed of 12 km / h. What is equal to: a) the speed of the first skier in the reporting system associated with the second skier; b) the speed of the second skier in the frame of reference associated with the first skier?**

Decision:

a) 10 -12 = -2 km / h (i.e. removed)

b) 12 -10 = 2 km / h (i.e. at first it approaches, then moves away when overtaking)

Answer: -2 km / h; 2 km / h

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