James can serve 10 customers in 5 minutes. Peter can serve 5 customers in 10 mintues. Working together, how many customers can they serve in 30 minutes.

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How many can each do in that time. Start by looking at each one separate

This question is asking you how many people James could serve in 30 minutes plus the number of people peter could serve in 30 minutes.
Let's start with James. If James could serve 10 customers in 5 minutes, and 30 minutes consists of six 5 minutes, how many customers can you serve in six 5 minutes?
Do the same for Peter. In 30 minutes there are three 10 minutes. If peter serves 5 customers in 10 minutes, how many customers could peter serve in three 10 minutes?
Because the question is asking you how many customers they can serve combined, you must then add up the number of customers each of them can serve in 30 minutes.
e.g.. # of customers Peter serves in 30min + # of customers James serves in 30min = your answer
After you are done the question, you can post your answer up here if you want and I will tell you if you are right. Also post how you got the answer here as well so if there are mistakes, I can tell you where you went wrong. It's best if you ask your parents for help though. Anybody with high school math experience would be able to answer your question.