siam needs m minutes to do a task. After he works for k minutes ,what part of the task remain uncomplete?

A k/m

B m/k

C (m-k)/m

D none of these

Correct Answer: Option C

Siam, does in m minute 1 or full part does in 1 minute 1/m part does in k minute k/m part so , work ,incomplete=1-k/m=m-k/m