Question

Два поезда едут на встречу друг к другу со скоростями 36км\ч и 54км\ч длина поездов 120м и 130м. Определите время,в течении которого поезда проходят мимо друг друга

Answer 1

120+150=270(км)-на столько больше
36:3,6=10(м/с)-скорость первого
54:3,6=15(м/с)скорость второго
270:(10-5)=54(с)

Answer 2

Calculation of the Time for the Trains to Pass Each Other

To determine the time it takes for the trains to pass each other, we need to consider their relative speeds and the sum of their lengths.

Given: - Train 1 speed: 36 km/h - Train 2 speed: 54 km/h - Train 1 length: 120 m - Train 2 length: 130 m

To calculate the time it takes for the trains to pass each other, we can use the formula:

Time = Distance / Relative Speed

The distance the trains need to cover to pass each other is the sum of their lengths:

Total Distance = Train 1 length + Train 2 length

Substituting the values into the formula, we have:

Time = (Train 1 length + Train 2 length) / (Train 1 speed + Train 2 speed)

Let's calculate the time:

Total Distance = 120 m + 130 m = 250 m

Time = 250 m / (36 km/h + 54 km/h)

To calculate the time in hours, we need to convert the distance from meters to kilometers:

Time = 250 m / (36 km/h + 54 km/h) * (1 km / 1000 m)

Now we can calculate the time:

Time = 250 m / (90 km/h) * (1 km / 1000 m)

Time = 2.78 seconds

Therefore, the trains will pass each other in approximately 2.78 seconds.

Please note that the above calculation assumes that the trains start passing each other when their fronts are aligned and continue passing until their rears are aligned.