Question

Two trains on opposite tracks leave the same station at the same time. One train travels at an average speed of 80 kilometres per hour and the other travels at an average speed of 70 kilometres per hour. How long after they leave the station will they be 50 km apart?

Answer 1

Answer: 20 minutes( 0.3333 hours) after they leave the station will they be 50 km apart, if the Two trains on opposite tracks leave the same station at the same time.

Explanation:
One train travels at an average speed of 80 km/hr and the other travels at an average speed of 70 km/hr.

Answer 2

1/3 hr or 20 min.

Explanation:

Call the trains A and B

Remember d = rt

Distance train A travels is 80t

Distance train B travels is 70t

Now, 80t + 70t = 50

150t = 50

t = 50/150 = 1/3 hr or 20 min.