You should plan ahead better. One Hour? Really!

Really Big Hint:

Compare A to B

Scale A: 34-10 = 24

Scale B: 31-15 = 16

It appears that B moves less than A in the ratio 16/24 = 2/3. So, B moves 2/3 times the movement of A.

Compare B to C

Scale B: 42-30 = 12

Scale C: 77-5 = 72

It appears that C moves more than B in the ratio 72/12 = 6. So, C moves 6 times the movement of B.

Okay, move A 18º and see what B does. Then see what C does.

Alternatively, you can do the tiny bit of algebra and relate A nd C directly.

Your choice.