Предмет: Математика, автор: Аноним

1.Первый автомобиль на 100 км в пути расходует 11 литров бензина, а второй 15 литров. Обоим автомобилям отпущено 104 литров бензина на 400 км пути. Сколько литров бензина отпущено каждому автомобилю?

2.Расстояние между деревнями 60 км, велосипедист проехал за 5 часов, а на обратном пути его скорость была на 3 км в час больше. За какое время он доехал обратно?

Ответы

Автор ответа: Zhiraffe

1. Первому автомобилю для преодоления 400 км требуется 400/100*11=44 литра.
Второму автомобилю для преодоления 400 км требуется 400/100*15=60 литров.
В сумме получаем действительно 60+44=104 литра.

2. Первый раз велосипедист ехал со скоростью 60:5=12 км/ч.
Обратно он ехал со скоростью 12+3=15 км/ч.
И потратил на обратный путь 60:15=4 часа.

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