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200m-1min
6km=6000m-x
x=6000*1min:200
x=30min
brat
250m-1min
6km=6000m-x
x=6000*1min:250
x=24min
Więc siostrze zajmuje to 30 minut, a bratu 24 minuty.
30min-24min=6min
Brat może wyjechać 6 minut później, aby dogonić siostrę przy szkole.
200m/min=12000=siostra
250m/min=15000= brat
15000-12000=30000+6=36000
36*2=72km.