Thread: Sumif?

I bother you with a problem which may seem very easy but not for me.
Basically I have two columns. In the first one I have numbers corresponding to some buses and in the second one how much time they drive every day. I want to compute how much time each bus drives every week. Something like: "if in the first cell is the number x add the time from the second cell". So if a bus number appers three times in the first column I want to see the total time. I hope I made myself clear. Thank you in advance!

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