When you try to find the distance a moving object has traveled, two pieces of information are vital for making this calculation: its speed (or velocity magnitude) and the time that it has been moving. With this information, it's possible to find the distance the object has traveled using the formula d = savg × t. To better understand the process of using the distance formula, let's solve an example problem in this section. Let's say that we're barreling down the road at 120 miles per hour (about 193 km per hour) and we want to know how far we will travel in half an hour. Using 120 mph as our value for average speed and 0.5 hours as our value for time, we'll solve this problem in the next step. Once you know the average speed of a moving object and the time it's been traveling, finding the distance it has traveled is relatively straightforward. Simply multiply these two quantities to find your answer.  Note, however, that if the units of time used in your average speed value are different than those used in your time value, you'll need to convert one or the other so that they are compatible. For instance, if we have an average speed value that's measured in km per hour and a time value that's measured in minutes, you would need to divide the time value by 60 to convert it to hours. Let's solve our example problem. 120 miles/hour × 0.5 hours = 60 miles. Note that the units in the time value (hours) cancel with the units in the denominator of the average speed (hours) to leave only distance units (miles). The simplicity of the basic distance equation (d = savg × t) makes it quite easy to use the equation for finding the values of variables besides distance. Simply isolate the variable you want to solve for according to the basic rules of algebra, then insert values for your other two variables to find the value for the third. In other words, to find your object's average speed, use the equation savg = d/t and to find to find the time an object has been traveling, use the equation t = d/savg.  For instance, let's...

How would you rephrase that briefly using Vietnamese?
Tìm thời gian và vận tốc trung bình. Nhân vận tốc trung bình với thời gian. Chuyển vế phương trình để tìm các biến số khác. Biến số "savg" trong công thức tính khoảng cách chính là vận tốc trung bình.