Question

How long will a boy sitting near the window of a train travelling at 102 km/h see a train passing by in the same direction with a speed of 30 km/h? The length of the slow-moving train is 120 m.​

Answer 1

Ответ:

4 seconds я так поняла сорри если не правильно

Answer 2

To find the time it takes for the boy to see the train pass by, we need to consider the relative speed between the boy and the passing train.

The relative speed is the difference in speed between the two trains, which is (102 km/h - 30 km/h) = 72 km/h.

We need to convert the relative speed from kilometers per hour to meters per second, as the length of the slow-moving train is given in meters. Since 1 kilometer is equal to 1000 meters and 1 hour is equal to 3600 seconds, the relative speed is:

72 km/h * (1000 m/km) / (3600 s/h) = 20 m/s

Now, we can calculate the time it takes for the passing train to cover the length of the slow-moving train. The formula to calculate time is distance divided by speed:

Time = Distance / Speed

Time = 120 m / 20 m/s

Time = 6 seconds

Therefore, the boy sitting near the window of the train will see the passing train for 6 seconds.