1) no
2) It's a straight line track, ie a great circle, the question is effectively asking you the initial great circle track A to B. Given that the initial true track = the initial gyro track, if you hold the initial gyro track on the gyro compass it will get you from A to B, true track will change as the true north reference changes (that's convergency in action) but the gyro will not. This is the strength of gyro navigation in high latitudes.
3) 090 deg true would be a rhumb line but this is not a straight line track, and therefore only relevant in calculating the great circle.
Calculate convergency, conv = ch long sin mean lat = 10 sin 60 (ish) = 8.6 deg,
Conversion angle = 1/2 convergency = 4.3 deg
Rhumb line = 090 deg, therefore initial great circle track = 090 - 4.3 = 085.7 deg
initial great circle track 085.7 deg true therefore grid track = 085.7 deg.
QED
....a bit heavy, though, this is really General Nav, and quite foxy for that.