which one is correct

[snade17]

Hi dear experts, could you tell which sentence is correct:

1. "We had run about a mile when we noticed that ......."
2. We had been running about a mile when we noticed that......"

[bhaisahab]

Hi dear experts, could you tell which sentence is correct:

1. "We had run about a mile when we noticed that ......."
2. We had been running about a mile when we noticed that......"

Both are correct.

[snade17]

Thank you very much!