Answer:
\[{{m}_{1}}={{m}_{1}},\,\,{{u}_{1}}=40m/s\]
\[{{m}_{2}}={{m}_{2}},\,\,{{u}_{2}}=0\]
\[{{v}_{1}}={{v}_{2}}=v=30m/s\]
\[\Rightarrow {{m}_{1}}\times 40+{{m}_{2}}\times 0=({{m}_{1}}+{{m}_{2}})30\]
\[\Rightarrow 40\,\,{{m}_{1}}=30\,\,{{m}_{1}}+30\,{{m}_{2}}\]
\[\Rightarrow 40\,\,{{m}_{1}}=30\,\,{{m}_{2}}\Rightarrow \frac{{{m}_{1}}}{{{m}_{2}}}=3:1\]
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