Two drivers \(\mathrm{G}\) and \(\mathrm{H}\) are at depths
\(20 \mathrm{~m}\) and \(40 \mathrm{~m}\) respectively below the water surface in a lake. The pressure on \(G\) is'P. while the pressure on \(\mathrm{H}\) is \(\mathrm{P} 2\). If the atmospheric pressure is equivalent to \(10 \mathrm{~m}\) of water, the value of \(\mathrm{P} / \mathrm{P} 1\) is ____________