I agree with Sussex Runner, I knew someone who did their first rather hilly 10k in 44 minutes, which isn't a bad time for a non-runner. He was a regular cyclist. A sub 40 runner probably isn't going to get faster by cycling, but it sure helps with hills if you cycle hard.
Overall though, to do a marathon you should put some long mileage runs in and see how you get on. If you can run 15 fairly comfortably, then fine. If you struggle then do some more running. I don't think there is a right or wrong way, everyone is different.
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