5
Q:
A) 3 hrs | B) 6 hrs |
C) 7 hrs | D) 5 hrs |
Answer: B) 6 hrs
Explanation:
Explanation:
Suppose A, B and C take x, x/2 and x/3 respectively to finish the work.
Then, (1/x + 2/x + 3/x) = 1/2
6/x = 1/2 => x = 12
So, B takes 6 hours to finish the work.