SOLUTION: When 6 students show up for the Swift River Cleanup Day, they can pick up all of the bottles and trash on their section of the riverfront in 2 1/2 hr. If 9 students show up, how lo

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: When 6 students show up for the Swift River Cleanup Day, they can pick up all of the bottles and trash on their section of the riverfront in 2 1/2 hr. If 9 students show up, how lo      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 203843: When 6 students show up for the Swift River Cleanup Day, they can pick up all of the bottles and trash on their section of the riverfront in 2 1/2 hr. If 9 students show up, how long will the same cleanup take?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
When 6 students show up for the Swift River Cleanup Day, they can pick up
all of the bottles and trash on their section of the riverfront in 2 1/2 hr.
If 9 students show up, how long will the same cleanup take?
:
Let t = time required using 9 students
;
You can solve this using man-hrs, given:
6 * 2.5 = 15 man-hrs required to do the job
Then
9t = 15
t = 15%2F9
t = 12%2F3 hrs if 9 students work
: