Question

Из двух городов расстояние между которыми168км навстречу друг другу выехали автом Скорость первого на12км/ч больше второго Они встретились через 1час 30 мин Кокава скорость второго

Answer 1

1 ч 30 мин=1,5 ч

1)   168:1,5=112(км/ч)-скорость сближения машин
2)   112-12=100(км/ч) - скорость сближения поровну
3)   100:2=50(км/ч)-скорость автобуса
4)   50+12=62(км/ч) - скорость машины

Answer 2

Problem Analysis

We are given that two cars start from two cities that are 168 km apart and are driving towards each other. The speed of the first car is 12 km/h faster than the speed of the second car. They meet after 1 hour and 30 minutes. We need to find the speed of the second car.

Solution

Let's assume the speed of the second car is x km/h. Since the speed of the first car is 12 km/h faster, the speed of the first car is (x + 12) km/h.

We can use the formula distance = speed × time to solve this problem. The distance traveled by the first car is the sum of the distances traveled by both cars, which is 168 km.

The time traveled by the first car is 1 hour and 30 minutes, which is equal to 1.5 hours.

Using the formula, we can set up the following equation:

distance of first car + distance of second car = total distance

((x + 12) km/h) × (1.5 hours) + (x km/h) × (1.5 hours) = 168 km

Simplifying the equation:

1.5x + 18 + 1.5x = 168

3x + 18 = 168

3x = 150

x = 50

Therefore, the speed of the second car is 50 km/h.

Answer

The speed of the second car is 50 km/h.