Question

4 Реши задачи. а) Рабочий зеленстроя должен был разложить рулонный га- зон 90 м за 6 часов. Он успевал разложить за час на 3 метра больше, чем предполагалось по плану. На сколько быстрее он сделает эту работу? - б) Расстояние между автомобилем и автобусом – 60 км. Ав- томобиль движется со скоростью 70 км/ч, автобус — 50 км/ч. Через сколько часов автомобиль догонит автобус (при условии, что они будут двигаться с такой же скоростью)? в) В городском субботнике приняли участие 128 бригад по 22 человека и 14 групп рабочих по 55 человек. Сколько всего человек приняли участие в субботнике? помогите пожалуйста схемой решить​

Answer 1

Ответ:

А) 90÷6=15(м)

15+3=18 (м)

90÷18=5(ч)

6-5=1(ч)

Ответ: на один час больше.

Б) 70-50=20(км)

60:20=3(ч)

Ответ: за 3 часа

В) 128×22=2 816(чел.) бригады

55×14=770(чел) в группах

2 816+770=3 586(чел)

Ответ:3 586 человек

Answer 2

Task a)

The worker from Zelenstroy had to lay out a roll of lawn 90 meters long in 6 hours. He managed to lay out 3 meters more per hour than planned. We need to find out how much faster he will complete the job.

To solve this problem, we can calculate the difference between the planned speed and the actual speed, and then divide the total distance by this difference.

Let's calculate it step by step:

1. Calculate the planned speed: 90 meters / 6 hours = 15 meters per hour. 2. Calculate the actual speed: planned speed + 3 meters = 15 meters per hour + 3 meters = 18 meters per hour. 3. Calculate the time it will take to complete the job at the actual speed: 90 meters / 18 meters per hour = 5 hours.

Therefore, the worker will complete the job 1 hour faster than planned.

Task b)

The distance between the car and the bus is 60 km. The car is moving at a speed of 70 km/h, while the bus is moving at a speed of 50 km/h. We need to find out how many hours it will take for the car to catch up with the bus, assuming they maintain the same speed.

To solve this problem, we can calculate the time it will take for the car to cover the distance between them.

Let's calculate it step by step:

1. Calculate the relative speed between the car and the bus: car speed - bus speed = 70 km/h - 50 km/h = 20 km/h. 2. Calculate the time it will take for the car to cover the distance: distance / relative speed = 60 km / 20 km/h = 3 hours.

Therefore, it will take the car 3 hours to catch up with the bus.

Task c)

In the city Saturday clean-up, 128 brigades of 22 people each and 14 groups of workers with 55 people each participated. We need to find out the total number of people who participated in the clean-up.

To solve this problem, we can calculate the total number of people in the brigades and the total number of people in the groups, and then add them together.

Let's calculate it step by step:

1. Calculate the total number of people in the brigades: 128 brigades * 22 people per brigade = 2816 people. 2. Calculate the total number of people in the groups: 14 groups * 55 people per group = 770 people. 3. Calculate the total number of people who participated: total number of people in the brigades + total number of people in the groups = 2816 people + 770 people = 3586 people.

Therefore, a total of 3586 people participated in the clean-up.

I hope this helps! Let me know if you have any further questions.