SOLUTION: A train left Podunk and traveled west at 70 km/h. Two hours later, another train left Podunk and traveled east at 90km/h. How many hours had the first train traveled when they were
Algebra ->
Expressions-with-variables
-> SOLUTION: A train left Podunk and traveled west at 70 km/h. Two hours later, another train left Podunk and traveled east at 90km/h. How many hours had the first train traveled when they were
Log On
Question 410876: A train left Podunk and traveled west at 70 km/h. Two hours later, another train left Podunk and traveled east at 90km/h. How many hours had the first train traveled when they were 1420 km apart? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = distance 2nd train goes when they are 1420 km apart
The 1st train has gone km when the 2nd train leaves.
Both trains travel for the same length of time when 2nd train leaves
2nd train:
1st train: km
By substitution: hrs
The 1st train traveled hrs
when they are 1420 km apart
check answer:
