I believe the answer is -2
Magnify the ant 5 times and magnify the crab spider 4 times so they can both be 20.
Boston would be 8 inches away on a map from WQ, because the library is in between Boston and WQ, and the library is 4 inches away from Boston, so, logically, it would be about 4 inches away from WQ, too.
Thus, Boston is 8 inches away from WQ.
The missing angle is 53 degrees (82+45=127) (180-127=53)