SOLUTION: two buses leave houston at the same time and travel in opposite directions. one bus averages 55mi/h and the other bus averages 45 mi/h. when will they be 400 mi apart?

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Question 705603: two buses leave houston at the same time and travel in opposite directions. one bus averages 55mi/h and the other bus averages 45 mi/h. when will they be 400 mi apart?
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
two buses leave houston at the same time and travel in opposite directions. one bus averages 55mi/h and the other bus averages 45 mi/h. when will they be 400 mi apart?
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They are separating at the rate of 55+45 = 100 mph
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Time = distance / rate = 400/100 = 4 hrs
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Cheers,
Stan H.
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Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Yhey are moving apart at the sum of their speeds
+55+%2B+45+=+100+ mi/hr
They will be 400 mi apart in +t+ hrs
+d+=+r%2At+
+400+=+100t+
+t+=+400%2F100+
+t+=+4+
They will be 400 mi apart in 4 hrs