1]A is thrice as good a workman as B and therefore it is able to finish a job in 60 days less than B.Working together they can do it in
a]20 days b]22 (1/2) days c]25 days d]30 days

ratio of time taken by A and B is 1:3
let days taken by A and B is x and 3x
difference = 2x
2x = 60
x = 30
Days taken by A and B is 30 and 90
total time taken if they work together = 1/30 + 1/90 = 22(1/2) days

2]A is 6 times as fast as B and takes 100 days less to complete a work than B.Find the total number of days taken by A and B to complete the work.
a]17 days b]17(1/2) days c]18 days d]19 days