Option B: 48 km/hr
To find the average speed of the car for the entire journey, we need to consider the total distance traveled and the total time taken.
     Step 1: Calculate the total distance traveled.
         ○ The car travels from A to B and then returns from B to A.
         ○ Distance from A to B = 360 km
         ○ Distance from B to A = 360 km
         ○ *Total distance* = 360 km + 360 km = 720 km
     Step 2: Calculate the total time taken.
         ○ Time taken to travel from A to B at 40 km/hr:
       \[
       \text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{360 \text{ km}}{40 \text{ km/hr}} = 9 \text{ hours}
       \]
         ○ Time taken to travel from B to A at 60 km/hr:
       \[
       \text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{360 \text{ km}}{60 \text{ km/hr}} = 6 \text{ hours}
       \]
         ○ *Total time* = 9 hours + 6 hours = 15 hours
     Step 3: Calculate the average speed.
         ○ Average speed is given by the formula:
       \[
       \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}}
       \]
         ○ Substituting the values:
       \[
       \text{Average Speed} = \frac{720 \text{ km}}{15 \text{ hours}} = 48 \text{ km/hr}
       \]
     Therefore, the average speed of the car for the entire journey is 48 km/hr.