A car has covered a distance of 120km in 5hrs. What is its instaneos speed and velocity at time t=20s
We can't say what the instantaneous velocity of the car was at different instants here. This is because we only have the total distance covered and the total time taken, we don't know anything else (for example, how the distance varies w.r.t. time, i.e., distance as a function of time). So, all we can know here is the average speed and velocity of the car, which is .