Two cars are 400 km apart. One car is traveling at 55 km/h and the other car is traveling at 45 km/h. If they start at the same time and are driving toward each other, how long will it take them to meet?

assume it will take them x hour to meet

55x+45x=400

100x=400

x=4 h

thus it will take them 4 hours to meet

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