We read the various newspapers that during the period from June, 20009 to September 2010, the Ministry of Road transport and Highways have achieved a target of constructing on an average 12.01 km of National Highways per day. However, this achievement if shorter compared to the target of constructing 20 km of Highways per day. To achieve this target, it is time approximately ________ of works are under way. Which among the following fills the blank correctly?