Question

Каменщик укладывает 4000 кирпичей за 8 часов , а монтажник краном укладывает один железобетонный блок, заменяющий 800 кирпичей , за 16 мин . во сколько раз меньше времени требуется монтажнику , чтобы уложить железобетонные блоки, заменяющие 4000 кирпичей

Answer 1

1)4000/800=5 (кирп)
2)16*5=80 (мин)
3) 8*60=480 (мин)
4)480/80=6 (раз)

Answer 2

To find the answer to your question, let's break it down step by step.

First, we need to determine how many bricks the mason can lay in the same amount of time it takes the crane operator to lay one concrete block.

The mason can lay 4000 bricks in 8 hours, which means they can lay 500 bricks per hour (4000 bricks / 8 hours = 500 bricks per hour) [[1]].

The crane operator can lay one concrete block that replaces 800 bricks in 16 minutes. To find out how many blocks the crane operator can lay in an hour, we need to convert the time to hours.

There are 60 minutes in an hour, so 16 minutes is equal to 16/60 = 0.27 hours (16 minutes / 60 minutes per hour = 0.27 hours).

Now, we can calculate how many blocks the crane operator can lay in an hour. Since one block replaces 800 bricks, the crane operator can lay (800 bricks / 0.27 hours) = 2962 blocks per hour (800 bricks / 0.27 hours = 2962 blocks per hour) [[2]].

Next, we need to determine how many blocks are needed to replace 4000 bricks. Since one block replaces 800 bricks, we can calculate the number of blocks needed as follows:

4000 bricks / 800 bricks per block = 5 blocks (4000 bricks / 800 bricks per block = 5 blocks).

Finally, we can calculate how much time the crane operator needs to lay the blocks that replace 4000 bricks. Since the crane operator can lay 2962 blocks in an hour, we divide the number of blocks needed by the rate at which the crane operator can lay blocks:

5 blocks / 2962 blocks per hour = 0.0017 hours (5 blocks / 2962 blocks per hour = 0.0017 hours).

To convert this to minutes, we multiply by 60:

0.0017 hours * 60 minutes per hour = 0.1 minutes (0.0017 hours * 60 minutes per hour = 0.1 minutes).

Therefore, the crane operator needs approximately 0.1 minutes to lay the concrete blocks that replace 4000 bricks, which is significantly less time compared to the mason who takes 8 hours to lay the same number of bricks.

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