Question

Печатая со скоростью 180знаков в минуту,машинистка набирает рукопись за 7часовсколько времени понадобиться машинистке на набор этой рукописи,если она будет печатать со скоростью 210знаков в минуту

Answer 1

1) 7*60=420 минут
2) 420*180=75600 знак
3) 75600 / 210= 360 минут
4) 360 / 60= 6 часов

Answer 2

7*60=420 всего минут при скорости 180
180/60=3 знака в секунду
420*60=25200 секунд всего при скорости 180
25200*3=75600 всего знаков
75600/210= 360 минут при скорости 210
360/60=6 часов при скорости 210/мин

ответ: 6 часов

Answer 3

Problem Analysis

We are given that a typist can type a manuscript at a speed of 180 characters per minute and it takes her 7 hours to complete the manuscript. We need to find out how long it will take her to type the same manuscript if she types at a speed of 210 characters per minute.

Solution

To solve this problem, we can use the formula:

Time = (Number of characters) / (Typing speed)

Let's calculate the time it takes to type the manuscript at a speed of 180 characters per minute:

Time1 = (Number of characters) / (180 characters per minute)

We are not given the number of characters in the manuscript, so we cannot calculate the exact time. However, we can use this information to find the ratio of the times.

Now, let's calculate the time it will take to type the manuscript at a speed of 210 characters per minute:

Time2 = (Number of characters) / (210 characters per minute)

We can set up a ratio equation using the given information:

Time1 / Time2 = 7 hours / x

where x is the time it will take to type the manuscript at a speed of 210 characters per minute.

To solve for x, we can cross-multiply and solve for x:

Time1 * x = Time2 * 7 hours

x = (Time2 * 7 hours) / Time1

Let's substitute the values we have:

x = ((Number of characters) / (210 characters per minute)) * 7 hours / ((Number of characters) / (180 characters per minute))

Simplifying the equation:

x = (180 / 210) * 7 hours

Now, let's calculate the value of x:

x = (6/7) * 7 hours

x = 6 hours

Therefore, it will take the typist 6 hours to type the manuscript at a speed of 210 characters per minute.

Answer

If the typist types at a speed of 210 characters per minute, it will take her 6 hours to type the manuscript.