From city A to city B, located at a distance of 390 km from city A, a freight train departed at a speed of 40 km / h

From city A to city B, located at a distance of 390 km from city A, a freight train departed at a speed of 40 km / h. At the same time, a passenger train departed from B to A at a speed of 90 km / h. How many kilometers were there between these trains 2 hours after they left? Will they have enough one more hour before the meeting?

1. Find out how many kilometers a freight train will travel in two hours if it moves at a speed of 40 kilometers per hour:

40 * 2 = 80 (km).

2. Let’s determine how many kilometers a passenger train will travel in two hours if it moves at a speed of 90 kilometers per hour:

90 * 2 = 180 (km).

3. Let’s find how many kilometers the trains will travel in two hours:

80 + 180 = 260 (km).

4. Find out what is the distance between these trains in two hours:

390 – 260 = 130 (km).

5. Let’s find out if one more hour is enough for them before the meeting:

90 + 40 = 130 (km).

Answer: there were 130 kilometers between the trains after their departure, one hour will be enough for them to meet.