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 ?
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 .
divide(add(1, add(divide(const_12, const_100), add(add(multiply(multiply(divide(1, 5), divide(1, 5)), 2), multiply(divide(1, 5), divide(1, 5))), divide(1, 5)))), const_60)