A boat goes 6 km an hour in still water but it takes thrice as much time in going the same distance against the current. The speed of the current (in km/h) is:

 A boat goes 6 km an hour in still water but it takes thrice as much time in going the same distance against the current. The speed of the current (in km/h) is:

A). 4

B). 5

C). 3

D). 2

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