From two cities, the distance between which is 420 km, two cars simultaneously drove towards each other

From two cities, the distance between which is 420 km, two cars simultaneously drove towards each other and met in 3 hours. The speed of one car was 60 km / h. how fast was the other car going?

1. Take the speed of the second car as x (km / h).

2. We calculate how many kilometers the first car moved from its settlement to the meeting point in 3 hours:

60 x 3 = 180 kilometers.

3. The oncoming car drove 3 kilometers to the meeting point during the same time.

4. Let’s compose the equation:

180 + 3x = 420;

3x = 240;

x = 80 km / h – the speed of the second car.

Answer: the speed of the second car is 80 km / h.