SOLUTION: A boy rides a bicycle at a certain rate for 5 km then decreases his rate by 2 km per hour and rode another 6 km. Find his original rate if he rode for a total of 140 minutes.

Question 1185052: A boy rides a bicycle at a certain rate for 5 km then decreases his rate by 2 km
per hour and rode another 6 km. Find his original rate if he rode for a total of 140
minutes.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The parts of trip are in two different parts.
140 minutes is 120 minutes plus 20 minutes, which is 2 hours 30 minutes
( or, two and one-third hours )

              SPEEDS     TIME hour     DISTANCE

part1          r         5/r             5

part2         r-2        6/(r-2)         6

TOTAL

You see what equation you can form?
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