In the following figure, \(PQRS\) is a rhombus. Diagonals \(PR\) and \(QS\) intersect at \(O\). \(L\) and \(M\) are mid-points of \(OP\) and \(OQ\) respectively. If \(PR\) \(=\) 42 \(cm\) and \(QS\) \(=\) 56 \(cm\), then \(LM\) is:
The value of \(LM\) \(=\) \(cm\)
[Note: Enter the answer upto one decimal place]