Question

If a postal worker can deliver the mail to 18 houses in 15 minutes, how many houses will the postal worker be able to deliver to in 1 hour?

Answer 1

60/15=4
18*4=72

72 houses

Answer 2

72 houses.

Explanation:

We are told that a postal worker can deliver the mail to 18 houses in 15 minutes.

Let us find numbers of mails delivered by postal worker per minute.

`\text{Number of mails delivered per minute}=\frac{18\text{ houses}}{15\text{ minutes}}`

`\text{Number of mails delivered per minute}=1.2\frac{\text{ houses}}{\text{ minute}}`

Since we know that 1 hour equals 60 minutes, so we will multiply 1.2 by 60 to find the number mails postal worker will deliver in 1 hour.

`\text{Number of mails delivered in 1 hour}=1.2\frac{\text{ houses}}{\text{ minute}}* 60\frac{\text{minutes}}{\text{hour}}`

`\text{Number of mails delivered in 1 hour}=1.2* 60\frac{\text{ houses}}{\text{hour} }`

`\text{Number of mails delivered in 1 hour}=72\frac{\text{ houses}}{\text{hour} }`

Therefore, the postal worker will be able to deliver mails to 72 houses in 1 hour.