To do a certain work the ratio of efficiency of A to that of B is 3 :
Right Answer is: B
Note: For this question, discrepancy is found in question/answer. Full Marks is being awarded to all candidates.
Ratio of efficiency of A : B = 3 : 7
A. T. Q.
When they work together, total work done by A and B in an hour = (3+7) unit = 10 unit
Work done by A and B in 8 days = 10 × 8 = 80
Remaining work = 105 – 80 = 25
60% of Remaining work
Required days by A to complete the 60% of Remaining work
= 5 days