The first 800 meters of the metro train passed at an average speed of 36 km / h, the next 900 m at a speed of 54 km / h.

The first 800 meters of the metro train passed at an average speed of 36 km / h, the next 900 m at a speed of 54 km / h. Determine the average speed of the train along the entire route

The average speed is found by the formula: V = S / t, where S is all the way, t is all the time. The entire path will be equal to: S = 1700m, and all the time we find through the speeds: t = s1 / v1 + s2 / v2, we get: t = 140c. This means that the average speed of the body along the entire path is: V = 12m / s.