Answer:
4 hours and 20 minutes
Step-by-step explanation:
4 1/3 hours
10:30 to 11:30 1 hour
11:30 to 12:30 1 hour
12:30 to 1:30 1 hour
1:30 to 2:30 1 hour
2:30 to 2:50 20 minutes 20 minutes/60 minutes = 1/3 hour
1+1+1+1 +1/3 = 4 1/3 hours
