# The locomotive went half the time at a speed υ1 = 72 km / h, and half the time

The locomotive went half the time at a speed υ1 = 72 km / h, and half the time – at a speed υ2 = 36 km / h. What is the average speed of a locomotive?

Task data: V1 (speed of the locomotive in the first half of the time) = 72 km / h; V2 (speed of the locomotive in the second half of the time) = 36 km / h.

Since the movement of a steam locomotive at a speed of 72 km / h and at a speed of 36 km / h took the same time intervals, the formula for calculating its average speed will look like: V = (V1 + V2) / 2.

Calculation: V = (72 + 36) / 2 = 54 km / h.

Answer: The average speed of a steam locomotive is 54 km / h.

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