What is the speed of a boat in still water?

Q: Answer-What is the speed of a boat in still water? Statement I: The boat covers 18 km in 3 hours downstrea...

Let the speed of the boat be u and that of the stream be v. Then, speed of boat downstream u v And speed of boat upstream u ndash v From I u v 183 6 kmhr helliphelliphellip.. i From II, u ndash v 186 3 kmhr helliphelliphellip ii From statement III, v u3 helliphelliphellip.iii From I and II, we get u 92 4.5 kmhr. From I and III, we get u u3 6 Or 4u 18 u 4.5 kmhr. Hence statement I and either II or III is sufficient to answer the question.

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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