A boat running downstream covers a distance of 16 km in 2 hours while for cover

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Question:  A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

Options are:

A.     4 km/hr
B.     6 km/hr
C.     8 km/hr
D.     Data inadequate

Correct answer is:

B.     6 km/hr