A train 150 metres long is running at a speed of 15 metres per second. In how much time (in seconds) it will cross a bridge of 300 metre long?

A train 150 metres long is running at a speed of 15 metres per second. In how much time (in seconds) it will cross a bridge of 300 metre long?
1). 10
2). 15
3). 30
4). 45

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