SOLUTION: Two cars leave town at the same time traveling in opposite directions. One car travels at 50 km per hour and the other travels at 55 km per hour. In how many hours will they be 420

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Question 613968: Two cars leave town at the same time traveling in opposite directions. One car travels at 50 km per hour and the other travels at 55 km per hour. In how many hours will they be 420 km apart?
Found 2 solutions by orangetiger8884, Charles1947:
Answer by orangetiger8884(3) About Me  (Show Source):
You can put this solution on YOUR website!
1 hour = 55 km + 50 km = 105 km
2 hours = 105 km + 105 km(55km +50km)=210 km
3 hours = 210 km + 105 km = 315 km
4 hours = 315 km + 105 km = 420 km
it will be four hours til they are 420 km apart

Answer by Charles1947(18) About Me  (Show Source):
You can put this solution on YOUR website!
Write a formula for miles apart and time.
Since they are traveling in opposite directions we add the miles each travel for each hour
50+55=105
SO
Each Hour=the number of miles divided by 105
OR
Hrs=miles%2F105
Hrs=420%2F105=4