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Решение задач В12(Б12) - ЕГЭ по математике

Решение задач В12(Б12) - ЕГЭ по математике

Задача №351Первый маляр красит стену на 2 часа быстрее, чем второй. Работая вместе, они красят эту же стену за 2 часа 55 минут. За какое время красит эту стену первый маляр?
#1
Посмотрите пожалуйста,что я не так делаю

Задача №352/Задача №225Прогулочный катер вышел в `14:00` из пункта А в пункт В,
расположенный в `20` км от А. Пробыв `15` минут в пункте В, катер отправился назад
и вернулся в пункт А в 18:00 того же дня. Определите (в км/ч) скорость
течения реки, если известно, что скорость катера равна `12` км/ч.

| +
Задача №225


Я вот так решаю:
Катер двигался `3,45` ч.

`20/(12+х)+20/(20-х)=69/20`

Обычно, в задачках таких квадратное ур-е должно получаться,а у меня:

`69х^2=8976`

В ответе `4` получится должно.Спасибо.

Отредактировано: silver Изучай правила: раз и два!
#2
Задача №353Из пункта А в пункт Б, расстояние между которыми 18км, одновременно выезжают два велосипедиста. Скорость одного из них на 5 км/ч меньше скорости другого. Велосипедист, который первый прибыл в Б, сразу же повернул обратно и встретил другого велосипедиста через 1 ч 20 мин после выезда из А. На каком расстоянии от пункта Б произошла встреча?
#3
Задача №354Два пешехода выходят навстречу друг другу из двух пунктов, расстояние между которыми 30 км. Если первый выйдет на 2 ч раньше второго, то он встретит второго пешехода через 4.5 ч после своего выхода. Если второй выйдет на 2 ч раньше первого, то он встретит первого пешехода через 5 ч после своего выхода. С какой скоростью идет каждый пешеход?
#4
Задача №355Турист, находящийся в спортивном лагере, должен успеть к поезду на ж/д станцию. Если он поедет на велосипеде со скоростью 15 км\ч то опоздает на 30 мин. Если же он поедет на автобусе со скоростью 40 км/ч то приедет на 2 ч раньше. Чему равно расстояние от лагеря до станции и сколько времени остается до отправления поезда?
#5
Задача №356Два печника могут сложить печь за 12ч. Если первый печник будет работать 2ч а второй 3 то они выполнят только 20% всей работы. За сколько часов может сложить печь каждый печник, работая отдельно?
#6
Задача №357Два грузовика, работая вместе, перевозили зерно в течение 4 часов. За какое время перевезет это же количество зерна второй грузовик, если первому из них нужно для этого на 6 часов больше, чем второму?
#7
Задача №358Два тракториста вместе вспахивают поле за 24 часа рабочего времени. Если же сначала будет работать один из них, а когда он вспашет половину поля, его сменит другой, то все поле будет вспахано за 49 часов. За сколько часов второй из них вспашет поле?
#8
Задача №359Путь от поселка до озера идет сначала горизонтально, а потом в гору. Велосипедист, добираясь до озера и обратно, на горизонтальном участке пути ехал со скоростью 12 км\ч, на подъеме - 8 км/ч, на спуске 15км\ч. Путь от поселка до озера занял у него 1 ч, а обратно 46 мин. Найдите рассстояние от поселка до озера?
#9
Задача №360Цена некоторого товара была сначала повышена на 10%, затем ещё на 120 рублей, и, наконец, ещё на 5%. Какова была первоначальная цена товара, если в результате повышение составило 31,25%?
#10
Задача №361велосипедист от дома до места работы едет со средней скоростью 10км\ч, а обратно со средней скоростью 15км\ч, поскольку дорога идёт немного под уклон.Найдите среднюю скорость движения велосипедиста на всём пути от дома до места работы и обратно.

заранее спасибо :)
#11
Помогите!
Задача №362Из города А в город В, расстояние между которыми равно 100 км,одновременно выехали велосипедист и мотоциклист. Скорость мотоциклиста на 30 км/ч больше скорости велосипедиста, и в В он приехал на 3 часа раньше, чем велосипедист.Найдите скорость велосипедиста.
#12
Задача №3631. Анна и Елена, работая вместе, могут перевести документы для переговоров с партнерами фирмы из Германии за 7 часов, Анна и Ольга — за 14 часов, а Елена и Ольга — за 8 часов 24 минуты. За какое время девушки переведут эти документы втроем, рабо¬тая вместе? Ответ запишите в минутах.


Задача №3642. Поезд, двигаясь равномерно со скоростью 72 км/ч, проезжает мимо платформы за 40 секунд. Найдите длину поезда (в метрах), если длина платформы 320 метров.
#13
Задача №365Велосипедист проехал с постоянной скоростью из города А в город В , расстояние до которого равно 120 км. Возвращался из пункта А на следующий день он со скоростью, на 2 км/ч большей прежней. По дороге он сделал остановку на 2 ч. В результате на обратный путь он затратил столько же времени, сколько на путь из А в В. Найдите скорость велосипедиста на пути из А в В, Ответ дайте в км/ч.


Задача №366Четыре рубашки дороже куртки куртки на 20%. На сколько процентов три рубашки дешевле куртки?
#14
Задача №367На изготовление 99 деталей первый рабочий затрачивает на 2 часа меньше, чем второй рабочий на изготовление 110 таких же деталей. Известно, что первый рабочий за час делает на 1 деталь больше, чем второй. Сколько деталей в час делает второй рабочий?
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