138 minutes
Explanation:
Step 1:
From the figure
1.30 to 2.30 means 60 minutes because 1 hour consists of 60 minutes
2.30 to 3.30 means 60 minutes
and finally
3.30 to 3.48 means 18 minutes
Step 2:
An finally add all those values to get minutes
60+60+18=138 minutes