Solving for distance traveled

Depending on which distance formula you re using, the input is quite different. One distance formula inputs the rate and time. The second distance formula inputs coordinates of points. And the third formula inputs just time. In all three cases, the output is a distance measure. 

When using the d = rt formula, you need to watch out for the units. If the rate is miles per hour, then you need to multiply by hours. 

This problem involves two different distances that are added together — the first distance that s traveled at 40 mph and the second distance that s traveled 

Multiplying miles per hour times hours or feet per second times seconds results in the distance because the fractions reduce, cancelling out units, as shown here. 

During a war, there was a bridge between two countries that was heavily guarded on the east side. A sentry tower on the east side was manned 24 hours a day. Every three minutes, a guard would come out of the tower to check on the bridge. His orders were to turn back anyone who was trying to cross the bridge to come to 

---