Answer:
[tex]\boxed{\textbf{6:57}}[/tex]
Step-by-step explanation:
[tex]\text{Average time} = \dfrac{\text{total time}}{\text{number of runs}}[/tex]
1. Add the hours and minutes separately
[tex]\begin{array}{rcr}7 &: & 12\\6 & : & 46\\6 & : & 53\\\mathbf{19} &:& \mathbf{111}\\\end{array}[/tex]
2. Calculate the average time
[tex]\text{Average time} = \dfrac{19:111}{\text{3}}[/tex]
The hours do not divide evenly by 3.
(a) Convert the hours to a multiple of 3.
Subtract 1 h from the hours and add 60 min to the minutes
[tex]\begin{array}{rcr}19 & : & 111\\- 1 & : & + 60\\\mathbf{18} & : & \mathbf{171}\\\end{array}[/tex]
Now, the hours are divisible by 3.
(b) Divide by three
Divide the hours and the minutes separately
[tex]\text{Average time} = \dfrac{18:171}{\text{3}} = \mathbf{6:57}\\\\\text{The average time for a delivery run was $\boxed{\textbf{6:57}}$}[/tex]
Answer:
6 hours 57 minutes
Step-by-step explanation:
1 hour = 60 minutes
On Monday delivery time = 7 hours 12 minutes
Change into minutes, 7 hours 12 minutes = 7×60+12 = 432 minutes
On Wednesday delivery time = 6 hours 46 minutes
Change into minutes, 6 hours 46 minutes = 6×60+46 = 406 minutes
On Friday delivery time = 6 hours 53 minutes
Change into minutes, 6 hours 53 minutes = 6×60+53 = 413 minutes
To find the average time for a delivery run.
[tex]\text{Average}=\dfrac{\text{Sum of all data}}{\text{Number of data}}[/tex]
[tex]\text{Average}=\dfrac{432+406+413}{3}[/tex]
[tex]\text{Average}=\dfrac{1251}{3}[/tex]
[tex]\text{Average}=417\text{ minutes}[/tex]
Now change 417 minutes to hour
60 minutes = 1 hour
417 minutes = 6 hours 57 minutes
Hence, the average time for a delivery run is 6 hours 57 minutes
