A has a 30% efficiency advantage over B. How long will it take them to do a project that A might have completed in 23 days if they worked together?
A. 11 days
B. 13 days
C. 20 3/17days
D. None of these
Answer:B
A has a 30% efficiency advantage over B. How long will it take them to do a project that A might have completed in 23 days if they worked together?
A. 11 days B. 13 days C. 20 3/17days D. None of these
Explanation: The ratio of time spent by A and B is 100:130, or 10:13.Assume B completes the task in x days.Then 10 : 13 : 23 : x => x = ( 23 x 13/10 ) => x = 299/10.1 day's labour for A = 1/23; 10 days' work for B = 10/299.1 day's work for (A + B) = ( 1/23 + 10/299 ) = 23/299 = 1/13.As a result, A and B can do the job in 13 days if they work together.