Question

Две автомашины движутся навстречу друг другу со скоростями 60 км/ч и 80 км/ч. Расстояние между ними 500 км. Какое расстояние между ними: а) через 2 ч? б) через 3 ч? Решите задачу двумя способами. помогите пожалуйста решиить.

Answer 1

1) 60*2=120-пройдёт 1машина за 2 часа 

2)80*2=160-пройдёт2 машина за 2 часа

3)120+160=280-сколько всего пройдут 2 машины

4)500-280=220-расстояние между ними 

 

 2 способ

 

1) 60+80=140-общая скорость

2) 140*2=280- общее расстояние

3) 500-280=220- расстояние между ними 

Answer 2

Problem Statement

Две автомашины движутся навстречу друг другу со скоростями 60 км/ч и 80 км/ч. Расстояние между ними 500 км. Какое расстояние между ними: а) через 2 ч? б) через 3 ч?

Solution 1: Using Basic Formula

To solve this problem, we can use the formula: distance = speed × time.

a) To find the distance between the cars after 2 hours, we can calculate the distance traveled by each car and then subtract it from the initial distance of 500 km.

Car 1: - Speed: 60 km/h - Time: 2 hours - Distance traveled by Car 1: 60 km/h × 2 hours = 120 km

Car 2: - Speed: 80 km/h - Time: 2 hours - Distance traveled by Car 2: 80 km/h × 2 hours = 160 km

Distance between the cars after 2 hours: 500 km - (120 km + 160 km) = 220 km

b) To find the distance between the cars after 3 hours, we can follow the same approach as above.

Car 1: - Speed: 60 km/h - Time: 3 hours - Distance traveled by Car 1: 60 km/h × 3 hours = 180 km

Car 2: - Speed: 80 km/h - Time: 3 hours - Distance traveled by Car 2: 80 km/h × 3 hours = 240 km

Distance between the cars after 3 hours: 500 km - (180 km + 240 km) = 80 km

Therefore, the distances between the cars are: a) After 2 hours: 220 km b) After 3 hours: 80 km

Solution 2: Using Relative Speed

Another way to solve this problem is by considering the relative speed between the two cars.

The relative speed is the sum of the speeds of the two cars when they are moving towards each other.

a) To find the distance between the cars after 2 hours, we can calculate the relative speed and then multiply it by the time.

Relative speed: 60 km/h + 80 km/h = 140 km/h

Distance between the cars after 2 hours: 140 km/h × 2 hours = 280 km

b) To find the distance between the cars after 3 hours, we can follow the same approach as above.

Relative speed: 60 km/h + 80 km/h = 140 km/h

Distance between the cars after 3 hours: 140 km/h × 3 hours = 420 km

Therefore, the distances between the cars are: a) After 2 hours: 280 km b) After 3 hours: 420 km

Please let me know if you need any further assistance!