Question

Поезд длиной 450 м проходит мост за 35 с, а мимо дежурной по станции за 15 с. Найдите скорость поезда и длину моста

Answer 1

1).450м:35с=13м примерно
13м*15с=195м

Answer 2

Problem Analysis

We are given that a train passes over a bridge in 35 seconds and past a station in 15 seconds. We need to find the speed of the train and the length of the bridge.

Solution

Let's assume the speed of the train is v m/s and the length of the bridge is L m.

When the train passes over the bridge, it covers its own length plus the length of the bridge in 35 seconds. Therefore, we can write the equation:

450 + L = v * 35 Similarly, when the train passes the station, it covers only its own length in 15 seconds. Therefore, we can write the equation:

450 = v * 15 We can solve these two equations simultaneously to find the values of v and L.

Solving the Equations

Let's solve equation for v:

v = 450 / 15 = 30 m/s Now, substitute the value of v from equation into equation:

450 + L = 30 * 35

Simplifying the equation:

450 + L = 1050

Subtracting 450 from both sides:

L = 1050 - 450 = 600 m

Answer

The speed of the train is 30 m/s and the length of the bridge is 600 meters.

Please let me know if I can help you with anything else.