Problema Solution
it takes 3hrs for 2 concrete mixers to mix a fixed amount of concrete. the number of hours varies inversely as the number of concrete mixers used. how long would it take 5 concrete mixers to do the same job?
Answer provided by our tutors
The number of concrete mixers used: N
The time: t
So the formula is
t = K/N
When t = 3, N=2, so K = 6
Wehn N = 5, t = 6/5 = 1.2
So it takes 1.2 hour for 5 concrete mixers to do the same job