6 workers should finish a job in 8 days. After 3 days came 4 workers join them. How many days M do they need to finish the same job?  Options
A) 3
B) 4
C) 5
D) 6
E) 7

Rationale: "let rate of one worker be r = > ( 6 * r ) * 8 = 1 ( rate * time = work ) = > r = 1 / 48 = > work remaining after 3 days 1 - ( 3 * 6 ) / 48 = 30 / 48 after 4 ppl joined in ( ( 6 + 4 ) * time ) / 48 = 30 / 48 time m = 3 days to finish the task imo a"
Answer: A