Hi All

I need help with excel to calculate automatically the time an aircraft has been parking.

Data:
Arriving Flight Data
Date Flight Nr Flight Reg Time Landed
30/11/2016 110 abc123 23:05
30/11/2016 148 fff333 20:45
01/12/2016 104 zzz909 16:40
01/12/2016 138 rrr565 17:45
01/12/2016 108 lll777 19:45

Departing flight Data
Date Flight Nr Flight Reg Time Depart
01/12/2016 101 abc123 06:45
01/12/2016 129 ffff333 07:50
01/12/2016 107 zzz909 17:35
01/12/2016 147 rrrr565 19:50
01/12/2016 109 lll777 20:50

I need excel to calculate the time on ground for each flight

Thanks for help