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задача
Велосипедист ехал 1,5 ч со скоростью 13,6 км/ч по асфальтированной дороге,после отдыха в тесение 0,2 ч ехал ещё 0,5 ч со скоростью 9,8 км/ч грунтовой дороге.найдите среднюю скорость велосипедиста?-
Предмет:
Математика -
Автор:
roach - 6 лет назад
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Ответы 1
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13,6*1,5 + 9,8*0,5=25,3(км) - расстояние проехал велосипедист1,5ч+0,5ч+2ч=4(часа) - время в пути25,3:4=6,3(км/ч) - средняя скорость
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Автор:
scout0juh - 6 лет назад
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We live on the earth. It is very, very big. There is a lot of water on the earth. It is in rivers, lakes, seas and oceans. There are a lot of forests and fields, hills and mountains on it. The earth is full of wonders. Different animals live on the earth. Different plants grow on it. The earth is beautiful. There are large countries and small countries. There are warm countries and cold countries. There are some countries where there are four seasons in a year and some countries where there are only two. When the sun shines it is day. When the sun does not shine it is night. When it is day in one country it is night in another. You can see the moon and the stars in the sky at night. People live in different countries. They speak different languages.
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