A particular disc can be made to rotate at 2 different speeds. If it were made to rotate slower by 135 revolutions per hour, it would require an additional 2.7-hour to make 315 revolutions. Find the higher speed at which it can operate.
Last edited by mr fantastic; Oct 25th 2010 at 11:41 AM.
Reason: Edited title.
A particular disc can be made to rotate at 2 different speeds. If it were made to rotate slower by 135 revolutions per hour, it would require an additional 2.7-hour to make 315 revolutions. Find the higher speed at which it can operate.
let be the higher speed of rotation in rev/hr
= time in hrs to rotate 315 rev at the higher speed
solve the system of equations for ... I'd start by using the first equation and solving for in terms of , then substitute for in the second equation.