On a foggy morning, two approaching bus drivers spot each other at 80 m distance. The speeds of the two buses are \( 72 \mathrm{kmh}^{-1} \) and \( 60 \mathrm{kmh}^{-1} \) , respectively. The drivers press their respective brake pedals immediately after spotting each other. If the retardation of each bus is \( 5 \mathrm{~ms}^{-2} \) . What is the total distance covered by the two buses before coming to rest?

A 40 m

B 27.7 m

C 67.7 m