Chemistry - Ideal Gas Question with Solution | TestHub

A teacher enters a classroom from front door while a student from back door. There are 13 equidistant rows of benches in the classroom. The teacher releases ${\mathrm{N}}_2\mathrm{O}$, the laughing gas, from the first bench while the student releases the weeping gas $\left({\mathrm{C}}_6{\mathrm{H}}_{11}\mathrm{OBr}\right)$ from the last bench. At which row from the front, will the students starts laughing and weeping simultaneously ? $(\mathrm{Br}=80)$