1-Tas is 80kts,the wind correction angle is +19 and headwind component is 20kts.What is the ground speed ?

2-True course is 055,wind 310/25.variation 6W and aircraft is flying with a true airspeed of 113 kts.What is the magnetic course ?

3-What is the difference between the latitude of the point A and the point B, which are located on following parallels of latitude:
A:15dgr 54` 30"N
B:10dgr 33` 30"S

Thank you,Nina