Two trains on opposite tracks leave the same station at the same time. One train travels at an average speed of 80 km/hr and the other travels at an average speed of 70 km/hr. How long after they leave the station will they be 50 km apart?
Two trains on opposite tracks leave the same station at the same time. One train travels at an average speed of 80 km/hr and the other travels at an average speed of 70 km/hr. How long after they leave the station will they be 50 km apart?
The combined rate of separation is (80 km/hr + 70 km/hr) = 150 km/hr,
therefore they will be 1/3 of 150 km apart after traveling 1/3 of an hour.
The answer is 1/3 hour, or 20 minutes
.
