a bus travels the first one by third distance at a speed of 10 km per hour the next one by third distance at a speed of 20 km per hour and the next one by the distance at a speed of 30 kilometre per hour find the average speed
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Answer:
180/11 km/h
Explanation:
avg speed = 3 / (1/v1 + 1/v2 + 1/v3)
= 3 / (1/10 + 1/20 + 1/30)
= 3 × 60 / ( 6 + 3 + 2 )
= 3 × 60 / 11
= 180 / 11 km/h
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