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.
Algebra ->
Surface-area
-> 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.
Log On
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
(