Question

Поезд двигаясь равномерно со скоростью 77 км/ч проезжает мимо идущего в том же направлении параллельно путям со скоростью 5 км/ч пешехода за 11 секунд. Найдите длину поезда

Answer 1

Если не ошибаюсь получится так 
V1=77км/час=21,39 м/с
V2=5км/час=1.39м/с
t=11с
 dS-?
S1=V1t=235,27m
S2=V2t=15,28
dS=S1-S2=220m

Answer 2

Problem Analysis

We are given that a train is moving uniformly at a speed of 77 km/h and passes a pedestrian walking in the same direction at a speed of 5 km/h in 11 seconds. We need to find the length of the train.

Solution

To find the length of the train, we can use the formula:

Length = Speed × Time

The speed of the train relative to the pedestrian is the difference between their speeds, which is 77 km/h - 5 km/h = 72 km/h.

Converting the speed to meters per second, we have:

Speed = 72 km/h × (1000 m/1 km) × (1 h/3600 s) = 20 m/s

Substituting the values into the formula, we have:

Length = 20 m/s × 11 s = 220 meters

Therefore, the length of the train is 220 meters.

Answer

The length of the train is 220 meters.