On January 1, 2014, the Kobe Construction Company entered into a three-year contract to build a dam. The original contract price was $21,000,000and the estimated cost was . $19,400,000The following cost data relate to the construction period.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

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Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?