Úloha ID 1607 - 
Na stavbě pracují tři dělníci: Kamil, Marek a Norbert. Kamil za jednu hodinu udělá 2/3 práce, kterou stihne Marek za stejný čas. Norbert udělá za jednu hodinu 2,5× více práce než Kamil.
Které z následujících tvrzení je pravdivé?
Správná odpověď je: B
Stanovíme 1p jako jednotku práce za hodinu. Když Norbert udělá 1p, tak Kamil udělá 0,4p (2/5) a Marek udělá 0,6p (3/2 · 2/5). Z toho vidíme, že Kamil a Marek jsou stejně rychlí jako Norbert sám.
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