SOLUTION: The time needed to make a photo enlargement varies jointly as its length and width. If it takes 12 seconds to make a 4" by 6" enlargement, how many seconds does it take to make one

Algebra ->  Rational-functions -> SOLUTION: The time needed to make a photo enlargement varies jointly as its length and width. If it takes 12 seconds to make a 4" by 6" enlargement, how many seconds does it take to make one      Log On


   

Question 1158657: The time needed to make a photo enlargement varies jointly as its length and width. If it takes 12 seconds to make a 4" by 6" enlargement, how many seconds does it take to make one that is 8" by 10"?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
T=kLW
12=k*6*4=24k
k=1/2
use k below
T=0.5*10*8
T=40 seconds