Two cars pass each other in opposite direction. how long would they take to be 500 km apart? i. the sum of their speeds is 135 km/hr. ii. the difference of their speed is 25 km/hr.
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i) Let us assume that one car is stationary with respect to our frame of reference. Then the other one is going far at 135 km/h. So it takes 500/135 = 100/27 hours or approximately 3.9 hours. The second information is useless!
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