If six 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? Choose the correct option: A) 45 B) 60 C) 72 D) 80 E) 100
using the std formula   m1d1h1/w1=m2d2h2/w2   substituting the values we have   6*1/2*4/3=2*5/3*x (converted 30 min into hours =1/2)   4=10/3*x   x=6/5 hour   so 72 minutes   ANSWER:72
<result>C</result>
If six 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?