It's quicker than you think!

To stop a car, first you require a certain reaction time to begin breaking; then the car slows under the constant breaking deceleration. Suppose the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.5 km/h and 24.4 m when its initial speed is 48.3 km/h. Then your reaction time is (assuming reaction time is same for each case and breaks provide uniform retardation)

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