From two cities, the distance between which is 604 km, a passenger train with a speed of 87 km / h

From two cities, the distance between which is 604 km, a passenger train with a speed of 87 km / h and a freight train with a speed of 64 km / h left simultaneously towards each other. In how many hours the trains will meet.

1. Accepted for x time after trains leave their settlements, after which they will meet.
2. The passenger train will proceed to the meeting point 87 km, the freight train – 64 km.
3. Considering that the total length of the track traveled by trains to the meeting is equal to the distance between settlements, we will compose the equation:
87x + 64x = 604;
151x = 604;
x = 4 hours.
Answer: the trains will meet 4 hours after the trains leave their settlements.