1. An 18.8 km long metro circle (ring) has 20 stations. It operates with a cycle time of 44 minutes and headways of 4 minutes. The average train standing time is 31 seconds.
   1. It is planned to reduce the standing time so that the number of TUs can be reduced by one. What should the new average standing time be to allow operation of the same schedule by one less TU?
   2. Compute the operating speed on the line now and with the change above.
   3. New rolling stock is being designed. It has a higher performance operating speed on the line at 3.2 km/h over the speed above. Assuming the headway remains the same, compute the new cycle time and number of TUs required.
   4. For the same change as c, what would the new headway be if the number of TUs remains the same as in the old schedule?