The time it takes to mow the lawn at a large Park m(x) varies inversely with the number of workers assigned to the job X it takes 90 minutes to complete the job when three workers are assigned to it. Which equation can be used to find the time to complete job when its workers are assigned to it?
A. m(x)=279/x
B. m(x)=270x
C. m(x)=30/x
D. m(x)=30x