March 7 2015 Las Vegas Kobalt Tools 400 NASCAR Practice #2 Speeds and 10 Lap Averages Ryan Rantz NASCAR News, Practice Speeds 10 Lap Averages, 2015, Las Vegas, Las Vegas Kobalt Tools 400, Las Vegas Practice #2 Speeds, Practice #2 Speeds, ten-lap averages Las Vegas Kobalt Tools 400 NASCAR Practice #2 Speeds and 10 Lap More