The speed of car is 64 kilometer per hour
Solution:
Given that car travelled a distance of D = 320 km for T = 5.0 hours
To find: speed (R) of the car in km per hour
Formula given:
D = R. T
where "D" is the distance
"R" is the speed of car
"T" is the time taken
Substituting the given values in above formula we get,

Thus the speed of car is 64 kilometer per hour
We cannot round the answer to nearest tenth, since answer is not in decimal