Solve it step by step.... Other wise i will downvote.......

An experimental packed adsorption column of 0.5 m bed depth is used for breakthrough study of a dilute vent stream having 0.02 mole fraction of a volatile organic. The breakthrough curve is symmetric and the effluent concentration is 0.01 mole fraction at 60 min. It is also found that it takes 15 min for the effluent concentration to increase from y = 0.0004 to y = 0.0196 (i.e. 2% to 98% of the influent concentration). What are the length and velocity of the MTZ? What bed height would you recommend if 90% utilization of the bed is to be achieved under the same operating conditions? What is the breakthrough time for this bed