My company tracks call time by day and one manager wants an average call time. I have the daily call time in minutes and number of calls per day in rows.

Call time in minutes per day
Bill - 230 300 456 345 456 233

Number of calls made per day
Bill - 34 17 39 56 49 14

I am trying to create a formula that will generate the average call time without have to create it for each column. I've been searching a lot and don't see any way of doing it. All the division by range examples take the data to one cell. I want it for each day. Anyway to do this without creating it for each column?