(Answered) A passenger on a train which is travelling northwards at 20

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A passenger on a train which is travelling northwards at 20 m/s observes a cyclist who is travelling westwards at 3 m/s. During the period of observation the shortest distance between the train and the cyclist is 30 m.

If visibility is 50 m, find the time span during which the passenger can observe the cyclist, to the nearest second.

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