In a bench blasting, as shown, 49 kg of explosive is put in each hole. The detonation time of holes, in millisecond, and the associated scale distance (SD) vs. peak particle velocity (PPV) plot for the given blast pattern is shown.
The PPV at a distance of 100 m, in \( \text{mm}\,\text{s}^{-1} \), is
. (rounded off to two decimal places)