A road will be built from city A to city B through vacant land with a distance as shown in the figure. From city A to B can pass 2 road conditions, road 1 (planned to pass the green road) and road 2 (the existing main road), if the maximum speed limit for road 1 is 20 KM/hour and the maximum speed limit for road 2 is 50 KM/hour, assuming the maximum speed of the vehicle, determine the best path (dotted line) in order to obtain the fastest (minimum) travel time from city A to city B

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