Speed Calc sans Radar

Algebra Level pending

I was driving to our neighboring city yesterday when I noticed a car overtaking us at a high speed. As soon as the car passed us I started to count out seconds until the car reached a crossroad and continued to count until we reached the same crossroad. If the first count was 17 and the second count was 27 and I maintained a uniform speed of 106 km/hr how fast was the other car going? Assume it also maintained a uniform speed. Give the answer to the nearest km/hr.

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