Using the hypothesis that the reduced time of officials continued to work on the enforcement of the wrench is equal to 40 minutes and is about 20 per cent of the total number of wrench force train all over the station.
Using the assumption that the reduction of staff time to work on enforcement wrench is 40 minutes and is working on a wrench 20 percent of all train stations.
Using the assumption that time reduction of staff time in working on forced the Jae was 40 minutes. And are working on a number of 20 force wrench and train all through the station