a) Table Q2 shows data obtained in a travel time study on a section of a 3.5km section of a highway, by the moving - observer method, using a high precision radar gun. If ordinarily the road stretch would be traversed at a speed of 50km/hour, determine the running speeds Northbound and southbound in units of km/hr. (20marks) Table Q2 Run direction Test vehicle overtaking Vehicles overtaking test vehicle Vehicles in opposing stream Travel speed(km/h) Northward 2 2 100 40.000 1 2 105 41.339 1 3 103 39.623 0 1 110 40.777 0 0 101 42.000 2 2 98 38.113 1 1 97 39.033 3 2 112 38.817 1 3 109 41.016 0 0 107 39.548 Southward 0 1 85 42.424 1 0 88 43.300 1 0 95 42.000 1 2 100 42.770 2 1 102 45.356 1 1 90 41.096