Question 1159675
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 bus travels 300 miles in the same amount of time as a car travels 270 miles. The rate of the car is 6 mph less than the rate of the bus. Find the rate of the car.
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<pre>
          SPEED        TIME           DISTANCE

BUS       r+6          300/(r+6)       300

CAR       r            270/r           270
</pre>
Question asks for r, and is found from  {{{300/(r+6)=270/r}}}.