A parking lot is 4/5 full. There are currently 80 cars in the parking lot. How many cars need to leave the parking lot to make t
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keep in mind, that "t" is the time when the train at A station, left towards B station
they met, at some time "t", and by the time that happened, train from A
which started 3 hours earlier, had already covered "d" distance,
whatever that is
and the train coming from B, covered, 600-d, or the difference