It takes 40 minutes for a typical E. coli cell to

completely replicate its chromosome. Simultaneous

to the ongoing replication, 20 minutes of a fresh

round of replication is completed before the cell

divides. What would be the generation time of

E. coli growing at 37 degree C in complex medium? 

A.20 min                           B.40 min 

C.60 min                           D.30 min