Question

Дорога длиной 415 км из пункта А в пункт C идёт через пункт B. Машина проехала от пункта А до пункта B со скоростью 55км/ч за 4 ч. С какой скоростью она должна ехать дальше чтобы на весь путь от А до С затратить 7 часов?

Answer 1

1) 55 *4=220(км)-расстояние которое проехала машина из пункта А до пункта В.                                                                                                                2) 415-220=195(км)-расстояние которое осталось проехать.                           3) 7-4=3(ч)-столько времени осталось.                                                                4)195:3=65(км/ч)-                                                                                                   Ответ :65 км/ч

Answer 2

#### Problem Analysis We are given a road that is 415 km long, going from point A to point C through point B. The car traveled from point A to point B at a speed of 55 km/h for 4 hours. We need to determine the speed at which the car should continue to travel in order to complete the entire journey from point A to point C in 7 hours. #### Solution To find the speed at which the car should continue to travel, we can use the formula: **Speed = Distance / Time** Let's calculate the distance from point B to point C first. Since the total distance is 415 km and the distance from point A to point B is already covered, the remaining distance is: **Distance BC = Total Distance - Distance AB** **Distance BC = 415 km - 55 km = 360 km** Now, let's calculate the time it took to travel from point A to point B: **Time AB = 4 hours** We know that the total time for the entire journey is 7 hours. So, the time remaining to travel from point B to point C is: **Time BC = Total Time - Time AB** **Time BC = 7 hours - 4 hours = 3 hours** Finally, we can calculate the speed at which the car should continue to travel: **Speed BC = Distance BC / Time BC** **Speed BC = 360 km / 3 hours = 120 km/h** Therefore, the car should continue to travel at a speed of **120 km/h** in order to complete the entire journey from point A to point C in 7 hours. #### Answer The car should continue to travel at a speed of **120 km/h** in order to complete the entire journey from point A to point C in 7 hours.