Question

Токарь вытачивает 72 детали за 3 часа а его ученику на выполнение этой работы нужно в 2 раза больше времени За сколько часов они выточат 72 детали работая в месте

Answer 1

72×3=216
72×2=144
216+144=360

Answer 2

1 ) 3×5=15
2) 72:15=4.8

Answer 3

Problem Analysis

We are given that a lathe operator can produce 72 parts in 3 hours, while their apprentice takes twice as long to complete the same task. We need to determine how long it will take for them to produce 72 parts if they work together.

Solution

Let's first calculate the rate at which the lathe operator produces parts. We can do this by dividing the number of parts produced (72) by the time taken (3 hours): - The lathe operator's rate = 72 parts / 3 hours = 24 parts per hour.

Since the apprentice takes twice as long to complete the task, their rate will be half of the lathe operator's rate: - The apprentice's rate = (1/2) * 24 parts per hour = 12 parts per hour.

To find the combined rate when they work together, we can add their individual rates: - Combined rate = 24 parts per hour + 12 parts per hour = 36 parts per hour.

Finally, we can calculate the time it will take for them to produce 72 parts by dividing the total number of parts (72) by the combined rate (36 parts per hour): - Time taken to produce 72 parts = 72 parts / 36 parts per hour = 2 hours.

Therefore, it will take them 2 hours to produce 72 parts when working together.

Answer

When the lathe operator and their apprentice work together, they will be able to produce 72 parts in 2 hours.