a car travels 30 km in 1 hour and next 40 km in 2 hours calculate the average speed of car?
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A man travels first 50 km at 25 kmph, next 40 km at 20 kmph and then 90 km at ... The average speed of the man (in km/hr). ... Total time taken = `(50/25 + 40/20 + 90/15)`hrs = 10 .
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