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Answer :
63.75km/hr is the car average speed fpr the entire journey.
Determine the average speed of a body
The formula for calculating average speed is expressed according to the formula below
Average speed = change in distance/water
Substitute the given parameter
Average speed = 90/2 + 75/4
Average speed = 45 + 18.75
Average speed = 63.75km/hr
Hence the car's average speed for the entire journey is 63.75km/hr
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