Question

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?

A 18 km/h
B 19 km/h
C 16 km/h
D 12 km/h
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