Answer:
Doug speed will be 65 km/hr
Step-by-step explanation:
Let the Thor's speed is x km/hr
So Doug's speed = x+1 km/hr
We have given that Doug and Thor take same time to cover 390 km and 384 km respectively
We know that time is given by

So time taken by Doug to cover the distance

And time taken by Thor to cover the distance

As both times are equal
So



So Doug speed will be 64+1 = 65 km/hr