When Fritz drives to work his trip takes 36 minutes, but when he takes the train it takes 20 minutes. Find the distance Fritz travels to work if the train travels an average of 48 miles per hour faster than his driving.

Question

anonymous · Answer

you can put his rate in the car as $x$ then since distance is rate times time you hav e
$$36x=D$$

anonymous · Answer

his rate on the train is $x+48$ so you also have 
$$20(x+48)=D$$

anonymous · Answer

since the distance is the same coming and going, that means 
$$36x=20(x+48)$$ 
solve for $x$ then find $D$