Answer:
a)

b)

Step-by-step explanation:
First we convert our minutes to hours so we work always in the same units.


Where we used the fact that 1 hour are 60 min, thus the multiplying factor is equal to 1 (not altering the time, just changing the units).
a) On the first part the motorist travels a distance
, and on the second part he travels
.
The total displacement is

b) The average velocity is the relation between the total displacement and the time taken to cover it. Our total time is t=0.6h+0.25h+2.2h=3.05h, thus we have:
