take mean of data within the same day pandas

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I have a dataframe df containing date of a measurement and the measurements (duration, km)

df
Out[20]: 
                          Date duration km
0   2015-03-28 09:07:00.800001    0      0
1   2015-03-28 09:36:01.819998    1      2
2   2015-03-30 09:36:06.839997    1      3
3   2015-03-30 09:37:27.659997    nan    5
4   2015-04-22 09:51:40.440003    3      7
5   2015-04-23 10:15:25.080002    0      nan

How can I calculate the average duration and km per day? I would like to take the mean of the rows using groupby and the date...

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