There is A one-way road one km long with two lanes, each lane five meters broad. Cars Cruise at 60 kmph on each lane. Distance between front bumpers of any two Successive cars is 10 meters which includes length of one car plus the clear Between the two cars. question (a): how many cars exit the road in one hour (your brilliant readers will find this childs play). then one morning mtnl digs a trench across one Lane at location half km of road length. The trench is 5m x 5m which makes a Single lane road for 10 meters (2.5 meters on either side of the trench for Maneuvering). As the driving discipline and etiquette of indian rivers is World famous they allow five cars from one lane and then five cars from The other lane to enter the single lane portion of the road. This Involves deceleration, stoppage and acceleration of cars. Assume optimum Points of stoppage and from the cruising speed. Question (b): how many cars Exit the road in one hour?

• velocity of the car = 60 kmph = 50/3 metres /sec
  
  means 50/3 road is cleared per sec.
  Distance between front bumpers of any two Successive cars is 10 meters which includes length of one car plus the clear Between the two cars.
  so (50/3)/10 = 5/3 cars exit one lane of road in 1 sec or 3600*5/3 = 6000 cars
  from two lanes , 2*6000 = 12000 cars exit the road.
  
  (b)
  In case of repair by MTNL, each lane is moving for half the time.
  so 6000/2 = 3000 cars exit the road and total 2*3000 = 6000 cars exit the road from both sides.
  
  
  
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