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A boy covers a distance of 60 km at a speed of 15 km/h by his motorcycle. Then he covers a distance of 48 km at a speed of 12 km/h by his car. Find the average speed of boy1. 11.5 km/h2. 7.5 km/h3. 9.5 km/h4. 10.5 km/h5. 13.5 km/h |
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Answer» Correct Answer - Option 5 : 13.5 km/h Given: Distance covered by motorcycle = 60 km Speed of motorcycle = 15 km/h Distance covered by car = 48 km Speed of car = 12 km/h Formula Used: Average Speed = Total Distance/Total Time Time = Distance/Speed Calculation: Time taken by motorcycle = 60/15 = 4 hours Time taken by car = 48/12 = 4 hours Total distance = Distance covered by motorcycle + Distance covered by car Total distance = 60 + 48 = 108 km Total time = 4 + 4 = 8 hours Average speed = 108/8 = 13.5 km/h ∴ The Average speed of the boy is 13.5 km/h. |
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