ISRO exam 2015 – Question 38 with Solution

In this video we are going to discuss another question which was asked in the exam of ISRO

Suppose two jobs, each of which needs 10 minutes of CPU time, start simultaneously. Assume 50% I/O wait time.
How long will it take for both to complete, if they run sequentially?
(A) 10
(B) 20
(C) 30
(D) 40