Question

На город напали 1200 злостных ниндзя! Мама, сын и дочь из Супер-семейки вызвались спасти город. Мама одна может расправиться с таким количеством злодеев за 40 минут, что составляет 4/6 времени, которое нужно сыну на это же количество злодеев. А дочь будет справляться с ними в 3 раза дольше, чем мама. Сколько времени им понадобится, чтобы справиться с ниндзя, если они будут работать все вместе?

Answer 1

Ответ:20 минут

Пошаговое объяснение:мама-30 в минуту, сын-20в минуту, дочь-10 в минуту. 1200:( 30+20+10)=20

Answer 2

Problem Analysis

To solve this problem, we need to determine the total time it will take for the mother, son, and daughter to defeat the 1200 ninjas. We are given that the mother can defeat the ninjas in 40 minutes, which is 4/6 of the time it takes the son to defeat the same number of ninjas. Additionally, the daughter takes 3 times longer than the mother to defeat the ninjas.

Solution

Let's break down the information given: - The mother can defeat the ninjas in 40 minutes. - The son takes 4/6 of the time it takes the mother to defeat the same number of ninjas. - The daughter takes 3 times longer than the mother to defeat the ninjas.

To find the total time it will take for them to defeat the ninjas together, we need to calculate the individual times for the son and daughter.

Let's start by finding the time it takes for the son to defeat the ninjas. Since the son takes 4/6 of the time it takes the mother, we can calculate his time as follows:

Son's time = (4/6) * Mother's time

Next, let's find the time it takes for the daughter to defeat the ninjas. We know that the daughter takes 3 times longer than the mother, so her time can be calculated as follows:

Daughter's time = 3 * Mother's time

Finally, to find the total time it will take for them to defeat the nin