maths

A car completes a trip in 20 minutes. for the first half of the trip the speed of the car was 100km/h and the speed for the second half of the trip was 90km/h. How far did the car travel (in km) if the distance for the first part is the same as the second part

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asked by lala
  1. Let the total distance be 2d. Then, since time = distance/speed,

    d/100 + d/90 = 1/3

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    posted by Steve

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