PS4 Resident Evil 5 Mercenaries United Solo Missile Area Sheva Business 150 kills

finally did it, after 2 weeks of trying on one of the last two remaining stages with sheva business for 150 kills. i have many failed tries that not able to find the remaining majinis even i have a minute left. but on this try, i know i have a good chance when i killed the red gatlingun majini with 2' 51" left. the mine is next. i hate those dogs and the reapers