Question

От железнодорожной станции 12.00 в противоположных направлениях отошли два электропоезда. Какое расстояние будет между ними в 12.15, если один электропоезд движется со скоростью 72 км/ ч , а другой - 84 км/ ч ?

Answer 1

72+84=156(км.)скорость удаления 12.15-12.00=15( мин.) это 1/4 часа 156:4=39(км.) будет расстояние между ними через 15 мин.

Answer 2

15 мин=0.25 ч
S=72км/ч*0.25ч=18км-первый э. поезд
S=84км/ч*0.25ч=21км - второй э. поезд
S.=21км+18км=39км - между ними

Answer 3

Calculation of the Distance Between the Two Trains

To calculate the distance between the two trains at 12:15, we need to consider the speeds at which they are traveling. One train is moving at a speed of 72 km/h, while the other is moving at a speed of 84 km/h.

Since the trains are moving in opposite directions, their relative speed is the sum of their individual speeds. Therefore, the relative speed between the two trains is 72 km/h + 84 km/h = 156 km/h.

To find the distance between the trains at 12:15, we need to determine how much time has passed since they departed from the railway station at 12:00. Since 15 minutes have passed, the time interval is 15 minutes, which is equivalent to 0.25 hours.

To calculate the distance, we can use the formula:

Distance = Speed × Time

Substituting the values into the formula, we have:

Distance = 156 km/h × 0.25 h

Calculating this, we find that the distance between the two trains at 12:15 is:

Distance = 39 km

Therefore, the distance between the two trains at 12:15 is 39 kilometers.