Hi,

Speed = distance/time

Let the actual car speed = x km/hr

therefore, the car is moving at x * 6/9 km/hr

Let the Distance be 50km

Time taken to cover 50km = 1hour 40min be 1+40/60 = 5/3 hrs

Distance = speed x time

50 = X * 6/9 * 5/3

X = 50 * 9 * 3 / 6* 5 = 45 km/hr

hopefully this information is helpful

Thankyou.