Does the smell from burning incense stick and deodorant spray reach someone on the other end at the same time?

A uniform glass tube of 100 cm length is connected to a bulb containing hydrogen at one end and and another bulb containing oxygen at the other end at the same temperature and pressure. The two gases meet for the first time at the following distance from the oxygen end

A car moving with a certain velocity jumps form an inclined plane placed at one bank of a river and reaches the other bank by attained a maximum height of 80 m if the same car moving with the same velocity jumps from another inclinded plane having different angle of inclination and reaches the same point on the other bank by attaining maxmimum height of 45 m then the width of the river is

If one of your friends lights a incense stick at one corner of a room, you can smell its sweet smell by standing at the other corner. How is it possible?