Firefighters from two cities and Clark County are fighting a three-alarm fire that forced the Speedway Casino/Ramada Inn at Interstate 15 and Cheyenne Avenue to evacuate its casino and hotel rooms. North Las Vegas firefighters responded to a call of smoke at the hotel and casino about 3:30 p.m. As smoke poured from the roof a second alarm was called, said Scott Allison, spokesman for the Clark County Fire Department.