Question 170684: two cars leave at the same point .the speed of the car is 75 kph and the other one is25 kph.at what time will they be 200 km apart?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! two cars leave at the same point .the speed of the car is 75 kph and the other one is25 kph.at what time will they be 200 km apart?
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If they go in opposite directions (180 degs apart), their speeds are added, is 100 kph. In that case it will take 2 hours.
If they go the same direction, they separate at the difference in their speeds, that is, the speed of one relative to the other is 75-25 = 50 kph, and it will take 4 hours.
If the angle between their directions is not 0 or 180 degs, it's more complex, but I can answer that if you think it's needed.
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Also, you asked "at what time", but you didn't say when they started so that cannot be determined.
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