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nastiaX352
nastiaX352
25.08.2020 01:26 •  Математика

Из двух городов, расстояние между которыми 510 км, одновременно навстречу друг другу выехали мотоциклист и автобус. скорость автобуса равна 54км/ч, а скорость мотоциклиста составляет 8 девятых скорости автобуса. через сколько времени они встретятся? на каком расстоянии друг от друга они будут через 3 часа после выезда? заранее !

👇
Ответ:
bedboy777
bedboy777
25.08.2020
54 : 9 х 8  = 48 км/час - скорость мотоциклиста
510 : (54 + 48) = 5 час - произойдёт встреча
510 - (54 + 48) х 3 = 204 км - расстояние между ними через 3 часа
4,6(79 оценок)
Ответ:
vovaste
vovaste
25.08.2020
1) 54/9=6x8=48км/час = скорость мотоциклиста .
2)48х3+144кс.
3)54х3=162км.
4)144+162=306
5)510-306=204 - разница через 3 часа
6)встретятся через 5 часов.
4,8(49 оценок)
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Ответ:
ROMMIT2
ROMMIT2
25.08.2020

Пошаговое объяснение:

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4,4(68 оценок)
Ответ:
rekrifcm
rekrifcm
25.08.2020
Как ребенку объяснить?
Ну смотри, пришли мы с тобой мультики смотреть. Кино началось в час, а мы посмотрети целых 3 мультика, они длятся по 2ч 35 минут
2 часа умножить на три, это сколько? 6 часов
А если еще 35 минут умножить на три? Это 30 минут три раза, это сколько? 1,5 часа. И плюс 5 минут умножить на 3. Это сколько? 15 минут. Складываем все. 6 часов+ 1.5 часа=7.5 часов, то нсть 7 часов и 30 минут. А 30+15? 45 минут. И того 7.45. Но смотри, мы пока первый мультик смотрели, кушать захотели. И пошли 30 минут покушали. А после второго пошли еще покушали. 30+30 это час. Прибавляем 7ч45мин+30минут=8ч15мин. К 13+8.15=21.15. Девять часов и 15 минут! Вся сложность, думаю, объяснить ребенку, что час-60минут
4,4(97 оценок)
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