Úloha ID 1599 - 
Dvě lodě se účastní závodu na 21 km. Jejich rychlosti jsou vyznačeny v grafu.
Urči pravdivé tvrzení.
Správná odpověď je: A
Pokud sečteme rychlosti obou lodí po 3 km úsecích, dostaneme pro loď A: 15 + 9 + 9 + 27 + 27 + 24 + 24 = 135 a pro loď B: 30 + 18 + 18 + 9 + 27 + 15 + 15 = 132. Průměrnou rychlost získáme vydělením sedmi (počet úseků), to ovšem není důležité, protože všechny úseky jsou stejně dlouhé. Na úseku 3–15 km mají pak obě lodě průměrnou rychlost 18 km/hod.
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