7. A car travels 5 kilometres up a hill at 10 km/h and back down at 20 km/h. What is the average speed for the entire trip?
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Answer:
Average speed = Total Distance/Total Time
Total distance = 5 + 5 = 10kms
Total time = 5/10 + 5/20 = 15/20 hours
Average Speed = 10/(15/20)
= 10 x 20/15 = 13 1/3 kmph
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