Two cars leave denver at the same time and travel in opposite directions. one car travels 10 mi/h faster than the other car. the cars are 300 miles apart in 3h. how fast is each car traveling?

Recall your d = rt, distance =  rate * time

let's say we have two cars, A and B, B has a speed rate of "r", so A is the faster one and has a speed rate of " r + 10 "

they both are 300 miles apart after 3hrs, after 3hrs, car has been running for 3hrs, and car B has also been running for 3hrs, so their time is the same

we know their distances added up, is 300miles, so if car B covered say, "d" distance on those 3hrs, car A covered the slack, " 300 - d "



solve for "r"

15:10. (part to part)
15:25 (part to whole)

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