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s=60*(t+1)
s=80t
s=60t+60
60t+60=80t
20t=60
t=3h
s=80t
s=240km
t=s/80
s=60*(t+1)
s=60*((s/80)+1)
s=3/4s+60 /*4
4s=3s+240
s=240 m