Based on the context and the answer, generate a question. 

Context: 10 minutes later , I was running around mopping up an overflowing toilet , which was backing up into the tub : ( : ( : ( I called Brad again , and they set up an emergency plumber to come help out . I ' m still waiting to hear about that , at 2:40AM . I ' m to call around 3 , to see what time in the morning he 'll be here .

Answer:

He was occupied with too much work .



What may be the reason the plumber is late ?