1003025102

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1003025102
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A car travels the first quarter of its journey at an average speed of 50kph, the second quarter at an average speed of 90kph, the third quarter at an average speed of 130kph and the remaining one quarter at an average speed of 80kph. What is the average speed of the car during the journey? Round the result to two decimal places.
77.97km/h
85.00km/h
87.50km/h
82.71km/h