How to finish mira’s quest? Getting 10 information is just impossible. I got only 1 information during 30 minutes.
Save-scumming is your friend. On the truck stop, sell yourself, then save and reload until you get "No one seems interested right now" then save and reload again, until you can talk to the whores around. If you're lucky, this would lead you to a loop that will complete the gathering intel quest right away.
Just to make this a bit more clear. It's impossible to actually talk to the working girls there directly. Well if you happen to actually know a few of them already, you can talk to them, but you get no useful information that way. That's not what is needed here. You have to prostitute yourself and hope that either no one "bites" and you talk to the girls instead (and get a useful information). Or sometimes one of the punters you go to bed with knows something about her. Rinse and repeat. As Pawpcorn already mentioned, save scumming helps a lot.
Some additional tips:
If you prepare a blue room, you can clean up and rest (and change clothes) there so you can do it in just one day/night without save scumming as well.
Best prepare the pill after if you don't want to end up pregnant afterwards.
You will end up bruised with a high probability so consider holding back 500 bucks and getting a treatment at the hospital. It will heal automatically after a few days as always but it could turn out pretty bad (as in my case) and you get several debuffs through heavy bruises.