From the information given:
Brain speed = 12.2 miles/hour
the time used to cover his speed = 1.45 hours
To find the total distance covered in 1.45 hours, we need to multiply speed with time.
i.e.
Using the relation;
speed = distance/time
Making distance the subject of the formula, we have:
The total distance covered = speed × time
The total distance covered = 12.2 miles/hour × 1.45 hours
There is an emphasis laid in the question that we should show how the multiplication(product) process with decimals is being carried out.
Now, counting from the back(i.e. the last number), we will make sure we count the number of digits we have before the decimal point.
That makes a total number of three(3) numbers before the decimal point.
So; we will ignore the decimal points first and do the calculation normally, then insert the decimal point in the third place from the back since we've determined that there are three numbers before the decimal point.
1 2. 2
×
1. 4 5
6 1 0
4 8 8
1 2 2
1 7 .6 9 0
Thus, counting from the back to place the decimal in the third place, we have: 17.690 miles
Therefore, the total distance covered by Brian is 17.690 miles
Learn more about multiplication here:
https://brainly.com/question/5992872?referrer=searchResults
