Question

Красная Шапочка испекла 20 пирожков,сложила их в корзинку и отправилась через лес к больной бабушке.Когда до бабушки осталось пройти 3 км,из кустов выскочил голодный волк с явным намерением съесть хоть что-нибудь. Увидев его,Красная Шапочка бросила ему на землю один пирожок и побежала со скоростью 2,5 м\с. Волк съел пирожок за 1 минуту и побежал за Красной Шапочкой со скоростью 5 м\с. Тогда Красная Шапочка стала бросать пирожки,как только волк начинал её догонять,и так добежала до бабушкиного дома.Сколько пирожков досталось бабушке?

Answer 1

10 пирожков.Во всяком случае у меня так.

Answer 2

Calculation of the Number of Cakes Received by Grandma

To calculate the number of cakes that Grandma received, we need to determine the distance covered by Little Red Riding Hood (LRRH) and the time it took for the wolf to catch up to her.

Given information: - LRRH baked 20 cakes. - LRRH threw one cake to the wolf when there were still 3 km left to Grandma's house. - LRRH ran at a speed of 2.5 m/s. - The wolf ate the cake in 1 minute and then ran after LRRH at a speed of 5 m/s. - LRRH threw cakes whenever the wolf started catching up to her.

Let's calculate the time it took for the wolf to catch up to LRRH:

Distance remaining when LRRH threw the first cake = 3 km = 3000 m Time taken for the wolf to catch up to LRRH = Distance / Relative Speed = 3000 m / (5 m/s - 2.5 m/s) = 3000 m / 2.5 m/s = 1200 seconds

Now, let's calculate the number of cakes LRRH threw:

Time taken for the wolf to catch up to LRRH = 1200 seconds Time taken for the wolf to eat each cake = 1 minute = 60 seconds

Number of cakes thrown = Time taken for the wolf to catch up to LRRH / Time taken for the wolf to eat each cake = 1200 seconds / 60 seconds = 20 cakes

Therefore, Grandma received 20 cakes.