Question

из санкт - петербурга в москву вышел товарный поезд с V 48 км/ч, через час после этого вышел скоростной поезд из москвы в санкт-петербург с V 82 км/ч.Найдите S между поездами а)через час после выхода скорого поезда,б)через 3 ч после выхода товарного поезда,в)через 5 ч после выхода скорого поезда.S между городами 650 км.

Answer 1

650-(2*48+1*82)=650-178=472 км через час после выхода скорого поезда

650-(3*42+2*82)=650-290=360 км через 3 ч после выхода товарного поезда

650-(6*42+5*82)=650-662=-12 - 12км через 5 ч после выхода скорого поезда после их встречи

Answer 2

650-48=602км-расстояние между поездами во время вызода скорого

602-48-82=472км-расст между поезд через час после выхода скорого

650-48*3-82*82=260км-через 3 часа после выхода товарного

82*5=410км-проедет скорый за 5 ч

650-410=240-останется проехать скорому

48*6=288км проедет тов за 6 ч

288-240=48км-расст между поездами через 5 ч после выхода скорого 

Answer 3

Calculation of the Distance between the Trains

To find the distance between the two trains, we can use the formula:

Distance = Speed × Time

Let's calculate the distance between the trains at different time intervals:

a) One hour after the departure of the express train:

The speed of the express train is V = 82 km/h. After one hour, the express train would have traveled a distance of 82 km.

b) Three hours after the departure of the freight train:

The speed of the freight train is V = 48 km/h. After three hours, the freight train would have traveled a distance of 48 km/h × 3 h = 144 km.

c) Five hours after the departure of the express train:

After five hours, the express train would have traveled a distance of 82 km/h × 5 h = 410 km.

Therefore, the distances between the trains at different time intervals are as follows:

a) One hour after the departure of the express train: 82 km b) Three hours after the departure of the freight train: 144 km c) Five hours after the departure of the express train: 410 km

Calculation of the Total Distance between St. Petersburg and Moscow

The total distance between St. Petersburg and Moscow is given as 650 km.

Therefore, the distance between the two trains is:

Total Distance - Distance between the Trains

a) One hour after the departure of the express train: 650 km - 82 km = 568 km b) Three hours after the departure of the freight train: 650 km - 144 km = 506 km c) Five hours after the departure of the express train: 650 km - 410 km = 240 km

Please note that the calculations are based on the given speeds and time intervals.