A car travels a certain distance with a speed of 90 km per hour and returns with a speed of 40 km per hour calculate average speed of whole journey.???here the speed is 90km/h
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Average speed = sum of 2 speeds/No. of total hours
= 90+40= 130/2 = 65km/hr.
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= 90+40= 130/2 = 65km/hr.
If useful than mark as brainliest
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