Answer :
Answer:
The correct answer is 27' (minutes). The problem actually has only one solution.
Explanation:
- We have to part from the basic speed-distance-time formula:
s=d/t
- The time until they are distanced 10 miles is the same since the two trains leave at the same moment. We will call that time: t
- We will call the first train: A
- d1 is the distance train A traveled until it is distanced 10 miles from train B
70=d1/t
70t = d1
- We will call the second train: B
- d2 is the distance train B traveled until it is distanced 10 miles from train A
60=d2/t
60t = d2
- So, the distance between A and B when the trains leave is: 45 miles
d1 + d2 + 10 = 45
70t + 60t = 35
130t = 35
t=27’
The problem actually has only one solution.
