Answer:
David will drive a total of 7 hours and 15 minutes to see his grandma.
Explanation:
To solve this problem, it is easiest to set up a dimensional analysis problem that allows us to multiply and cancel units. This is shown below.
435 miles * 1 hour/60 miles
Since miles appears both in the numerator and denominator, we know that this unit will cancel, so our answer will be in units of hours.
435/60 = 7.25 hours
This means that David's trip will take 7.25 hours. However, the question asks for the time David will travel in hours and minutes, so we must convert this answer into those units.
We can keep the number 7 because it represents the number of full hours David will drive, but we must convert 0.25 hours into minutes. Since there are 60 minutes in 1 hour, we can multiply 0.25 * 60 to find out how many minutes David will drive.
0.25 * 60 = 15
Therefore, David will drive a total of 7 hours and 15 minutes to see his grandma.
Hope this helps!
