Question

два поезда расстояние между которыми 300км двигались навстречу, 1)рез сколько часов произайдет встреча, ели 1п-80км\ч, а 2п-70км\ч. 2)какое расстояние будет между поездами через 3ч после встречи, если они будут продолжать двигаться с той же скоростью?

Answer 1

встреча произойдет через два часа

первый поезд пройдет 80км/ч*2=160км

второй поезд пройдет 70км/ч*2=140км

160+140=300

за 3 часа после встречи

первый поезд пройдет 80км/ч*3=240км

второй поезд пройдет 70км/ч*3=210 км

между ними будет 240+210=450 км

Answer 2

1) 80 + 70 =150 (км/ч) - скорость сближения

2) 300 : 150 =2 (ч) - время встречи

3) 150 * 3 =450 (км) - будет через 3 ч.

 

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Answer 3

Calculation of Meeting Time

To calculate the time it takes for the two trains to meet, we can use the formula:

Time = Distance / Relative Speed

Given that the distance between the two trains is 300 km and the first train is moving at a speed of 80 km/h while the second train is moving at a speed of 70 km/h, we can substitute these values into the formula:

Time = 300 km / (80 km/h + 70 km/h)

Simplifying the equation:

Time = 300 km / 150 km/h

Calculating the time:

Time = 2 hours

Therefore, the two trains will meet after 2 hours.

Calculation of Distance after 3 Hours

To calculate the distance between the two trains after 3 hours, we need to determine how far each train has traveled in that time.

The first train is moving at a speed of 80 km/h, so in 3 hours it will have traveled:

Distance of the first train = Speed of the first train * Time = 80 km/h * 3 hours = 240 km

The second train is moving at a speed of 70 km/h, so in 3 hours it will have traveled:

Distance of the second train = Speed of the second train * Time = 70 km/h * 3 hours = 210 km

To find the distance between the two trains after 3 hours, we subtract the distance traveled by the second train from the initial distance between the two trains:

Distance between the two trains after 3 hours = Initial distance - Distance of the second train = 300 km - 210 km = 90 km

Therefore, the distance between the two trains after 3 hours will be 90 km if they continue to move at the same speeds.