A student completed homework assignments. For the first 3 assignments, she spent 1 hour 30 minutes on each. For the next 4 assignments, she spent 1 hour 5 minutes on each. If she wants to average 80 minutes per assignment over 8 assignments, how much time must she spend on the eighth assignment?
1 hr 40 min
1 hr 45 min
1 hr 50 min
1 hr 55 min
2 hr 0 min
