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The two cars left from the East and West stations at the same time. They met 45 kilometers away from the east station for the first time. After that, the two cars continued to advance at the original speed. When they arrived at the station, they returned immediately and met again at 9 kilometers east of the midpoint. How many kilometers are the two stations apart?
45x3 = 135 km
apart
（135-9）÷(1+1/2)
=126÷3/2
=84km
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The two cars started from the East and West stations at the same time. For the first time, they met 60 kilometers away from the east station. After that, the two cars continued to advance at the original speed. After arriving at each other's station, they both returned immediately and met 30 kilometers west of the midpoint. How many kilometers are the two stations apart?
(60 + 60 × 2 + 30) △ 1.5 = (60 + 120 + 30) △ 1.5 = 210 △ 1.5 = 140 (km) answer: the distance between the two stations is 140 km
The two cars left the east station and the west station at the same time. For the first time, they met 60 kilometers away from the east station. After that, the two cars continued to run in the same way
Go at the same speed. When the trains arrive at the station, they immediately return and meet at 30 kilometers west of the midpoint. How many kilometers are there between the two stations?
After arriving at the station, the trains return immediately, and then meet 30 kilometers away from the terminal. How many kilometers is the distance between the two stations?
At the first meeting, the two cars traveled a whole journey, of which the first car (the one starting from the East Station) traveled 60 km. At the second meeting, the two cars traveled three whole journey, of which the first car traveled 60 × 3 = 180 km. At this time, the first car had turned back from the west station and left for the east station for 30 km, that is, the journey of the first car
The two cars started from the East and West stations at the same time and met for the first time 70 kilometers away from the east station. After that, the two cars continued to advance at the same speed
After arriving at each other's station, they all return immediately. They meet 30 kilometers to the east of the midpoint. How many kilometers are the two stations apart
If the distance is set at x km, there are:
70：(x-70)=(x+x/2+30):(x+x/2-30);
(x-70)(3x/2+30)=70(3x/2-30);
3x²/2+30x-105x-2100=105x-2100;
3x²/2-180x=0;
3x²-360x=0;
3x(x-120)=0;
x=120;
So the distance is 120 kilometers
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