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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Percentages
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A bus travels the first 1/3 of a certain distance with a speed of 20 km/hr, the next 1/3 distance with a speed of 40 km/hr, and the last 1/3 distance with a speed of 120 km/hr. Find the average speed of the bus for the whole journey ?


( A ) 42
( B ) 36
( C ) 30
( D ) 28

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