SOLUTION: 1. Shelby completes one lap of a go­cart track every 40 seconds. Laura  completes one lap of the same track every 30 seconds. Suppose Shelby and Laura  cross the starting line at t

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: 1. Shelby completes one lap of a go­cart track every 40 seconds. Laura  completes one lap of the same track every 30 seconds. Suppose Shelby and Laura  cross the starting line at t      Log On


   



Question 1017830: 1. Shelby completes one lap of a go­cart track every 40 seconds. Laura  completes one lap of the same track every 30 seconds. Suppose Shelby and Laura  cross the starting line at the same time.
a)  How many seconds will pass before they cross the starting line at the same  time again? 
b)  How many laps will Shelby have completed in that time? 
c)    How many laps will Laura have completed in that time?

Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
a) How many seconds will pass before they cross the starting line at the same time again?
at 120 second, the LCM, least common multiple.
b) How many laps will Shelby have completed in that time?
3
c) How many laps will Laura have completed in that time?
4