If four machines working at the same rate can do 3/4 of a job in 30 minutes, how many minutes would it take two machines working at the same rate to do 3/5 of the job?
Select:
A) 48
B) 60
C) 75
D) 80
E) 100
using the std formula   m1d1h1/w1=m2d2h2/w2   substituting the values we have   4*1/2*4/3=2*5/3*x (converted 30 min into hours =1/2)   8/3=10/3*x   x=4/5 hour   so 48 minutes   48NSWER:48
<result>A</result>
If four machines working at the same rate can do 3/4 of a job in 30 minutes, how many minutes would it take two machines working at the same rate to do 3/5 of the job?