Treść zadania

nancygirl15

Pociąg towarowy jedzie przez most o długości 800m ze stałą prędkością 18 km/h. Od chwili wjechania parowozu na most do chwili zjechania z tego mostu ostatniego wagonu upłynął czas 6m40s. Opisz ilość wagonów wraz z lokomotywą, jeśli wiadomo, że wagony i lokomotywa mają po 20m.
Prosiłabym o rozwiązanie krok po kroku :)

Zadanie jest zamknięte. Autor zadania wybrał już najlepsze rozwiązanie lub straciło ono ważność.

Najlepsze rozwiązanie

  • 0 0

    18 km/h = 18 * 1000 / 3600 = 5 m/s
    6m40s = 400s

    5 * 400 = 2000m

    W ciągu 6 minut 40 sekund pociąg przejechał 2000m.

    2000m - 800m = 1200m

    po odjęciu długości mostu otrzymujemy długość pociągu

    1200 / 20 = 60

    Pociąg składa się z lokomotywy i 59 wagonów (60 jednostek)

Rozwiązania

  • userphoto

    18 km/h = 18000 m/h = 5 m/s
    6 min i 40 sek = 400 sekund
    Teraz trzeba pomnożyć
    5 m/s * 400 s = 2000 m
    Czyli przez 6 min i 40 sek przejechał 2000 metrów

    Teraz trzeba odjąć 2000 m - 800 m ( długość mostu) =1200 m

    Taka jest długość pociągu

    I teraz trzeba 1200 podzielić przez 20 ( bo wagon ma 20 metrów ) = 60 wagonów

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