Answer:
Her usual driving speed is 38 miles per hour.
Step-by-step explanation:
We know that:

In which s is the speed, in miles per hour, d is the distance, in miles, and t is the time, in hours.
We have that:
At speed s, she takes two hours to drive. So


However, on one particular trip, after 40% of the drive, she had to reduce her speed by 30 miles per hour, driving at this slower speed for the rest of the trip. This particular trip took her 228 minutes.
228 minutes is 3.8 hours. So

So




Her usual driving speed is 38 miles per hour.
To find the equation, we first need to change the unit as you did correctly:
1 feet = 12 inches
In this case,let's turn the unit of depth to feet:
4÷12
= 1/3 feet
Then we can find the volume in inches:
1/3×162×6
=54×6
=324 ft^3
Therefore the answer is B.324 ft^3 .
Hope it helps!
Sorry, mate but it cannot be solved. m is a complicated number like

But if you really want the answer, here it is:
m = (5 ± 3

) / 4
If it helps, can you give me the brainliest answer? I need it...
Thank you very much.
The answer is the third choice: -1