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A speeder in an automobile passes a stat...

A speeder in an automobile passes a stationary policeman who is hiding behind a bill board with a motorcycle. After a `2.0` sec delay (reaction time) the policeman accelerates to his maximum speed of `150km//hr` in `12 sec` and catches the speeder `1.5km` beyond the billboard. find the speed of speeder in `km//hr`.

Text Solution

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122.7 km/hr
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