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A Car travels 1/3 of the total distance at a speed of 30 km/hr, 1/6 of the totaldistance at a speed of 60 km/hr, and rest of the distance at a speed of 50 km/hr. Findits average speed for the journey. |
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Answer» Answer: Step-by-step EXPLANATION: AVERAGE speed = Total distance traveled / Total time taken Let total distance traveled be X km One THIRD = x/3 km Time taken = x/90 Time taken for 1/6 = x/360 Remaining distance = 1 - (1/3 + 1/6) = 1/2 km Time taken for remaining = x/100 Total time taken = x/90 + x/360 + x/100 = 40x+10x+36x/3600 = 86x/3600 Average speed = x / (86x/3600) = 3600x/86x = 3600/86 = 1800/43 = 41.86 km/hr |
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