Answer: ask for permission to arrive about 12:15 in the afternoon to the meeting and reply the customer question first.
Step-by-step explanation:
Most of the actions taken inside a company are directed to customers' satisfaction, they are an important part of all business, so they have to be a priority. In this case, the worker can explain to the supervisor the urgent necessity of replying to the customer and the previous promise that has done of replying by noon. The supervisor may understand the important situation and summarize for the worker the 10 first minutes of the meeting; in this way the worker won't miss the meeting and will keep his commitment with the customer.