`50` volumes of hydrogen take `20 min` of diffuse out of a vessel. How long will `40` volumes of oxygen take to diffuse out from the same vessel under the same conditions?

Explanation

`(V_(1)//t_(1))/(V_(2)//t_(2))=sqrt((d_(2))/(d_(1)))=(50//20)/(50//t_(2))=sqrt((16)/(1))`
`(5xxt_(2))/(2xx40)=4`
`:. T_(2)=64 min`