Two brothers

Two brothers want to collect 20 kg of chestnuts. If only Marek collected, he would make it in 30 minutes. It would take Milan 10 minutes longer. How long after Mark does Milan have to start collecting to be finished in 18 minutes?

Correct result:

t =  2 min


a=30 min b=a+10=30+10=40 min    18/a+(18t)/b=1 18/30+(18t)/40=1  3t=6  t=2=2 min

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