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Если одному рабочему, чтобы выполнить какую- то работу потребуется 7 с половиной часов, а другому рабочему на эту же работу нужно 5 часов, то за сколько времени они смогут выполнить ее вместе?
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Предмет:
Математика -
Автор:
savanna - 5 лет назад
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Ответы 1
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Задача решается через нахождение производительности труда, т.е. количество выполняемой работы за единицу времени. Примем всю работу за единицу. Тогда за один час первый рабочий выполнит 1:7,5=10/75 части работы Второй - 1/5 работы в час. Вместе за один час рабочие выполнят 10/75+1/5=1/3 часть работы Всю работу они выполнят за 1:¹/₃=3 (часа)
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Автор:
kelton - 5 лет назад
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Помогите перевести текст с английского UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND: The full and official name of the country is the United Kingdom of Great Britain and Northern Ireland. It is situated on the group of islands lying just off the mainland of the north-western Europe. The total area оf the country is over 244,000 square kilometres.
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