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Велосипедист и мотоциклист выехали одновременно из двух поселков навстречу друг другу. велосипедист -- со скоростью 15 км/ч, а мотоциклист -- со скоростью 57 км/ч расстояние между поселками 288 км. какое расстояние будет между ними через 3 ч после начала движения?

Математика

Ответы

Корягина
Задача на нахождение расстояния, времени, скорости
Условия задачи:
S=288 км
v₁=15 км/ч
v₂=57 км/ч
t=3 ч
Найти:
S =? км, если t=3 ч
Решение
1) 15+57=72 (км/ч) - скорость сближения велосипедиста и мотоциклиста
2) S(расстояние)=v(скорость)×t(время)
S=72×3=216 (км) - расстояние, которое за 3 часа проедут велосипедист и мотоциклист.
3) S=288-216=72 (км) - расстояние, которое будет между велосипедистом и мотоциклистом через 3 часа.
ответ: 72 км
serkinn69

Пошаговое объяснение:

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arhangel1055

Пошаговое объяснение:

9)

(30088-27028):30+29*31=1001

1)

_30088

27028

3060

2)

_3060 |__30

30 |102

_60

60

0

3)

29*31=20*31+9*31=620+279=899

4)

102+899=1001

10) магазины

1 магазин

1)4*190=760(руб) стоят 4 полотенца

2)760+950=1710 (руб) стоят полотенца и противень

3)5*90=450 (руб) стоят 5 стаканов

4)1710+450=2160 (руб) стоят 5 стаканов 4 полотенца и противень

5)2160+500=2660 (руб) вся покупка первого магазина

2магазин

1)220*4=880 (руб) стоят 4 полотенца

2)880+940=1820 (руб) стоят 4 полотенца и противень

3)5*80=400 (руб) стоят 5 стаканов

4)400+1820=2220(руб) стоят 4 полотенца, противень, 5 стаканов

5)2220+470=2690(руб) вся покупка второго магазина

ответ: 2660 рублей покупка первого магазина. Дешевле.

11) города

Согласно графику, город Пекин 4 по численности населения

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Велосипедист и мотоциклист выехали одновременно из двух поселков навстречу друг другу. велосипедист -- со скоростью 15 км/ч, а мотоциклист -- со скоростью 57 км/ч расстояние между поселками 288 км. какое расстояние будет между ними через 3 ч после начала движения?
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