Refer to figure. 
Planned Time (LIBLO → BTA):
Using the following formula:

• Time (min) = Distance (NM) / Groundspeed (kt) x 60
• Time = 35 NM / 190 kt x 60 = 11 min

Planned Time (BTA → ELB):
Using the following formula:

• Time (min) = Distance (NM) / Groundspeed (kt) x 60
• Time = 41 NM / 190 kt x 60 = 13 min

Planned Time (ELB → UPADU):
Using the following formula:

• Time (min) = Distance (NM) / Groundspeed (kt) x 60
• Time = 5 NM / 190 kt x 60 = 2 min

Planned Total Time: 5 min (LFKJ → AJO) + 13 min (AJO → LIBLO) + 11 min (LIBLO → BTA) + 13 min (BTA → ELB) + 2 min (ELB → UPADU) + 13 min (UPADU → LIRS) = 57 minutes