40mm
When the connecting rod is suspended at A, the periodic time is given by:-
(i)
When the conrod is suspended at B, the periodic time is given by:-
(ii)
At the same,total length between A and B is:-
(iii)
It can be seen that in equation (i),(ii) and (iii) there are three unknowns, i.e. k, 
and 
.Therefore, solving the three equations simultaneously, the three unknowns can be determined.
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