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M: +1.00/-0.25

Bala travels first one-third of the total distance at the speed of 10 km/h and the next one-third distance at the speed of 20 km/h and the last one – third distance at the speed of 60 km/h. What is the average speed of Bala?

[IB ACIO Previous Year 2017]
A
B
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D
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