Answer:
They left the house at 1:20 P.M.
Explanation:
The movie was an 1 1/2 so 4:30 - 1:30 = 3:00
Thy got there 50 minutes before so 3:00 - 0:50 = 2:10
It took them 50 minutes to get there so 2:10 - 0:50 = 1:20
Therefore they left the house at 1:20 P.M.