Five trains leave the station at equal intervals of time from 7.20am till 4pm. At what intervals do the trains leave?
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The probability that you have to wait more than x minutes for the first train to arrive is ... (NB: If x=5 they will arrive at the same time at 0:45, but if the offset is less than 5 ... We can let the initial delay between trains be 0≤x<5, since the other delays of ... time of 7.5 minutes when arriving at the station in one of these intervals.
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