A student studied 1 hr 20 min each day for 4 days and 1 hr 45 min each day for 2 days. How long would they have to study on the seventh day in order to average 90 minutes of studying each day for the entire time?
1 hr 20 min
1 hr 30 min
1 hr 40 min
1 hr 50 min
2 hr
