Question

Сначала поезд двигался со скоростью 80 м/мин. После разгона он увеличил скорость в 15 раз. Какую скорость набрал поезд в пути? Выразите её в километрах в час.

Answer 1

80*15=1200 (м/мин)
1200 м/мин=1200:1000*60=72 км/ч
Ответ: поезд набрал скорость 72 км/ч

Answer 2

Calculation of the Train's Speed

To calculate the final speed of the train, we need to consider that the train initially traveled at a speed of 80 m/min and then increased its speed by 15 times.

Let's break down the calculation step by step:

1. The initial speed of the train is 80 m/min. 2. The train increased its speed by 15 times, which means the final speed is 15 times the initial speed. 3. To convert the final speed from meters per minute to kilometers per hour, we need to multiply it by a conversion factor. There are 60 minutes in an hour and 1000 meters in a kilometer.

Now, let's calculate the final speed of the train:

1. Initial speed: 80 m/min. 2. Final speed: 80 m/min * 15 = 1200 m/min. 3. Conversion to kilometers per hour: 1200 m/min * (60 min/1 hour) * (1 km/1000 m) = 72 km/h.

Therefore, the train's final speed is 72 km/h.