The average video watch time

This code is meant to return the average of a list of watch times (in minutes). It runs without an error and the first printed line is right, but the second printed line looks wrong. Fix just one place so that the output is 30.0 and 15.0.

Code to fix

def average(times):
    total = 0
    for t in minutes:
        total += t
    return total / len(times)

minutes = [20, 30, 40]
print(average(minutes))
print(average([10, 20]))