train a b c d e have 3 station towards london but have 4 station from london
it takes 5 min to station 1 10min to station 2 30 min to station 3 and 1hour to station 4
train a and b goes 30min break from at each station
c and d has a 40 min break at each station
trains c and d start at london
a and b start at bristol
they all set of at 20:30
what time will they meet
give your answer in 24hour clock
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I tink they will meat at 8: 30
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