Two trains leave stations 450 km apart at the same time, traveling toward each other. One travels at 80 km/h and the other at 70 km/h. How long until they meet?
Answer
3 hours
How to solve it
1
Combined speed: 80 + 70 = 150 km/h
2
Distance: 450 km
3
Time = distance ÷ speed = 450 ÷ 150 = 3 hours
Hints
What is their combined speed?
They are closing the gap together
Divide distance by combined speed