Let the speed of the car be x km/hr.
Distance = 36 km
Time taken to cover a distance of 36 km = 36/x hrs
New time taken by the car to cover a distance of 36 km = 36/(x+10) hrs
From the given information, we have:
But, speed cannot be negative. So, x = 30.
Hence, the original speed of the car is 30 km/hr.
