Concept: The question tests on the area of Rates(Time and Work)

Solution:

Ram does 40% = 2/5th of the work in 12 days

To complete the work, time taken = 112/(2/5) =30 days


The remaining work is 60% = 60 /100 = 3/5th of the work

Working together they finish 3/5th of the work in 12 days

Therefore to do the complete work = 112/(3/5)= 20 days


Work done by Ram in 1 day = 1/30

Let Ravi take x days to finish the work. Work don by Ravi in 1 day = 1/x

1/30+1/x=1/20

 1/x=1/20−1/30=3−2/60=1/60

Ravi takes 60 days to complete the work which is twice the time Ram takes

Ram is 100% more efficient than Ravi


 Option B