A locomotive driver travelling at 81 km/hr finds a signal 280 metres ahead of him indicating that he should stop. He instantly applies brakes to stop the train. The train retards uniformly and stops 10 metres before the signal post. What time did he take to stop the train?

A locomotive driver travelling at 81 km/hr finds a signal 280 metres ahead of him indicating that he should stop. He instantly applies brakes to stop the train. The train retards uniformly and stops 10 metres before the signal post. What time did he take to stop the train?
1). 5 seconds
2). 10 seconds
3). 15 seconds
4). 20 seconds

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