Okay... need some help figuring out these questions on the gouge (maybe rule of thumb used and or source). Some I can figure out with some trig, but no calcs allowed during test.

You are on the XYZ VOR 090° radial at 20 DME. You are instructed to proceed direct to the XYZ VOR 180° radial at 70 DME. The direct, no wind heading is:
a) 185°
b) 190°
c) 195°
d) 200°

You are at airport A located at 33’20”N 108’02”W. You are flying to airport B located at 35’55”N 107’58”W. Approximately how many miles is it from airport A
to airport B?
a) 4
b) 120
c) 155
d) 200

You are on the XYZ 270 radial at 30 DME. You are cleared to fly the 30 DME arc to the 300 radial, and hold. You are flying at .6 Mach and it is 1800z. At what time will you arrive at the holding fix?
a) 1805z
b) 1810z
c) 1815z
d) 1820z

You are on the XYZ VOR 090 radial at 30 DME and you need to fly direct to the 190 radial at 60 DME. What is the no wind heading.
a. 180
b. 190
c. 210
d. 235

You are located at 34’20” N and 108’02 W and 38’50” N and 107’58” W. How many miles is it between coordinates

What causes the loud noise of a jet engine?
a. High speed of compressors
b. Fast moving air being ejected (Guessing it's this one but can't find source)
c. The hot gases mixing with the cooler atmosphere
d. Something Else

If there is another forum dedicated to this stuff, please point me in the right direction. Any help would be appreciated! Interviewing Tuesday and these are the last unanswered/non-sourced ques I have.