Question 724116
Law of Sines is a key.


A and B are points of each crocodile.  AB is 20, Calvin-to-A is 30.  If angle at Calvin is 58 degrees, then {{{sin(B)/30=sin(58)/20}}}, which makes {{{sin(B)=(3/2)*0.848}}}, {{{sin(B)=2.968}}}, IMPOSSIBLE.  So one of the measurements must be wrong.  Sine of an angle must be between -1 and +1.  


Either distance to A must be less, or distance AB must be more, or the angle at Calvin must be less.  That all was for part (a).