Question 159376
2 cars start from the same place and time, traveling in opposite directions, one averaging 65km p/h, the other 90km p/h. After how long will they be 450km apart ? 
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They're getting farther apart at the sum of their speeds.
65 + 90 = 155 kph
The time to get 450 km apart is 450/155
= 2.90322 hours
= 2 hours 54 minutes