Physics

To find the car's average speed for the entire trip, we need to calculate the total distance traveled and the total time taken.

 

Calculate total distance:

Distance traveled west: 300 km

Distance traveled east: 150 km

Total distance = 300km + 150km = 450km

 

Calculate total time:

Time taken for the westward trip: 4 hours

Time taken for the eastward trip: 2 hours

Total time = 4hours + 2hours = 6hours

 

Then, calculate average speed:

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