Question

What is the speed of a boat in still water? Statement I: The boat covers 18 km in 3 hours downstream. Statement II: The boat covers the same distance in 6 hours upstream. Statement III: The speed of the stream is one –third that of boat in still water.

A Only I and II
B Only II and III
C All I, II and III
D I and either II or III
E The question cannot be answered even with the information in all the three statements.
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