Пошаговое объяснение:
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В решении.
Пошаговое объяснение:
Расстояние по трассе между двумя посёлками 1540 м. Из этих посёлков одновременно навстречу друг другу выехали два велосипедиста. Скорость первого равна 3 м/с, скорость второго 4 м/с. Какое расстояние будет между велосипедистами через 3 мин после начала движения? Через какое время после начала движения велосипедисты встретятся?
Формула движения: S=v*t
S - расстояние v - скорость t – время
3 минуты=60*3=180 секунд.
1)Найти расстояние 1 велосипедиста:
3*180=540 (м).
2)Найти расстояние 2 велосипедиста:
4*180=720 (м).
3)Какое расстояние будет между велосипедистами через 3 мин после начала движения?
1540 - (540+720)= 280 (м).
4)Через какое время после начала движения велосипедисты встретятся?
Общее расстояние 1540 м.
Общая скорость 3+4=7 (м/сек).
Общее время: 1540 : 7 = 220 (сек.)
У мамы было 700 рублей. На покупку шоколадных конфет она потратила 5/12 этой суммы, значит, у нее осталось 1 - 5/12 = 7/12 изначальной суммы. Вычислим, сколько осталось денег
700 * 7/12 = 408 1/3.
Найдем, сколько она потратила денег на 2 кг карамели по 120 рублей за кг.
2 * 120 = 240 рублей.
Вычислим, сколько у нее осталось денег после этой покупки.
408 1/3 - 240 = 168 1/3.
Сколько стоят 2 шоколадки по 45 рублей?
2 * 45 = 90 рублей.
168 1/3 > 90.
Оставшихся 168 1/3 рублей хватит на шоколадки.