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Two buses leave Philadelphia at the same time and travel in opposite directions. The north bound bus travels

at a rate of 55 mph. The southbound bus travels at a rate of 45 mph. When will they be 400 miles apart?

1 Answer

3 votes

Answer:

4 hours

Explanation:

55x + 45x = 400

100x = 400

x = 400/100

x = 4