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Q1:
What is the speed of the boat in still water?
I.  The speed downstream is 12 kmph.
II.  The speed upstream is 4 kmph.
 III.  In a to and fro journey between two points, the average speed of the boat was 6 kmph.

A Any two of the three

B I and II only

C All I, II and III

D Any two of the three

E III, and either I or II