Answer:
The required probability is 
Step-by-step explanation:
The probability of obtaining a defective item from container 1 is 
The probability of obtaining a good item from container 1 is 
The probability of obtaining a defective item from container 2 is 
The probability of obtaining a good item from container 2 is 
The cases of the event are
1)Defective item is drawn from container 1 and good item is drawn from container 2
2)Defective item is drawn from container 2 and good item is drawn from container 1
Thus the required probability is the sum of above 2 cases

57/6 = 1/x
57 = 6x
x = 0.11 miles per minute
Well, I can't really answer the question without seeing the illustration, I cannot tell you what Alex's checking account balance is now, because of the fact that I do not know what it was before. If you change the question so it includes this, I would be delighted to help you!