SOLUTION: Ellen and Kate raced on their bicycles to the library after school. They both left school at 3 pm and bicycled on the same path. Ellen rode at a speed of 12mph and Kate rode at 9

Question 1042508: Ellen and Kate raced on their bicycles to the library after school. They both left school at 3 pm and bicycled on the same path. Ellen rode at a speed of 12mph and Kate rode at 9mph. Ellen got to the library 15 min before Kate. What time did Ellen get to the library?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Start with time quantities, and deal with time points later. Identify knowns and unknowns.

                RATE       TIME        DISTANCE
Ellen           12         t-1/4         d
Kate             9          t            d

Basic travel rates rule, RT=D

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