SOLUTION: Frank traveled north in his car at 55km/h. Fred traveled south in his car at 35 km/h. After how long will they be 810 km apart?

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Question 162898: Frank traveled north in his car at 55km/h. Fred traveled south in his car at 35 km/h. After how long will they be 810 km apart?
Answer by Anthea Lawn(22) About Me  (Show Source):
You can put this solution on YOUR website!
This one is easily solved by noticing that since they travel in opposite directions, then after one hour, they will be 55 + 35 = 90 km apart.
If each hour takes them 90 km away from each other, they will be 810km apart after 810/90 = 9 hours.