Question

a plumber charged $12 for 15 minutes of work. At this rate, what would the plumber charge for 1 hour of work?

Answer 1

There are 4 15 minute periods in an hour, so you would multiply the 15 minute rate by 4 giving you 12•4. The answer is 48.

Answer 2

$ 48

Explanation:

Given,

Total charge = $ 12,

Time = 15 minutes =
`(1)/(4)` hour,

( ∵ 1 hour = 60 minutes ⇒ 1 minute =
`(1)/(60)` hour ⇒ 15 minutes =
`(15)/(60)` =
`(1)/(4)` hour )

Thus, the speed of charge =
`\frac{\text{Total charge}}{\text{Time in hours}}`

`=(12)/(1/4)`

= $ 48 per hour,

Hence, the plumber charges $ 48 for an hour.