Question

Вася может прополоть грядки за 1 ч 40 мин, но, проработав 40 мин, он ушёл на тренировку. Его заменил младший брат Стасик,который закончил прополку через 90 мин. За какое время Стасик один мог бы прополоть грядки?

Answer 1

1ч40мин=100 минут

100-40минут=60 минут ему оставалось

90/60=1,5 во столько раз больше времени понадобится младшему брату для полной работы

100*1,5=150 минут=2ч30мин.

Answer 2

1ч40мин=100 минут

100-40минут=60 минут ему оставалось

90/60=1,5 во столько раз больше времени понадобится младшему брату для полной работы

100*1,5=150 минут=2ч30мин.

  Ответ 2часа 30минут или 2,5часа

Answer 3

Problem Analysis

Vasya can weed the beds in 1 hour and 40 minutes, but he left for training after working for 40 minutes. His younger brother Stasik finished weeding after 90 minutes. We need to determine how long it would take Stasik to weed the beds alone.

Solution

To find the time it would take Stasik to weed the beds alone, we need to subtract the time Vasya worked from the total time it took Stasik to finish.

Let's break down the given information: - Vasya can weed the beds in 1 hour and 40 minutes, which is equivalent to 100 minutes. - Vasya worked for 40 minutes before leaving for training. - Stasik finished weeding after 90 minutes.

To find the time it would take Stasik to weed the beds alone, we can subtract the time Vasya worked from the total time it took Stasik to finish:

Total time taken by Stasik - Time Vasya worked = Time Stasik would take alone

Let's calculate it:

Total time taken by Stasik = 90 minutes Time Vasya worked = 40 minutes

Time Stasik would take alone = Total time taken by Stasik - Time Vasya worked Time Stasik would take alone = 90 minutes - 40 minutes Time Stasik would take alone = 50 minutes

Therefore, Stasik would take 50 minutes to weed the beds alone.