A bike passes 21 telegraphic poles in a minute’s time.

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A bike passes 21 telegraphic poles in a minute’s time. The distance between any two consecutive poles is 40 meters. What is the average speed of the bike in Kilometres per hour ?

[DSSSB TGT 2014 (Science)]

A 4.8 Km/h

B 48 Km/h

C 480 Km/h

D 0.48 Km/h