a qualified worker digs a well in 5 hours . he invites 2 apprentices , both capable of working 3 / 5 as fast and 2 trainees both working 1 / 5 as fast as he . if the 5 - person team digs the same well , how much time does the team need to finish the job ? Choose the correct choice from the following answers:
A) 1 : 42
B) 1 : 34
C) 1 : 44
D) 1 : 54
E) 2 : 14

Rationale: and answer is correct as you have calculated : 100 / 59 hrs that is 1.71 hrs - 1 hr and 42 minutes , so 1 : 42 , hence , a .
Answer: A