Question

The given question consists of a set of statements. Find out whether the data provided in the statements are sufficient to answer the question and mark the option:

What is the speed of the boat in still water?
I. It takes 2 hours to cover the distance between A and B downstream.
II. It takes 4 hours to cover the distance between A and B upstream.

• A. I and II only
• B. I and either II or III only
• C. II and either I or II only
• D. III and either I or II only
• E. None of these

Answer 1

The correct option is D

III and either I or II only

Let AB =xkm

I. Speed downstream = $\frac{x}{2}$km/hr

II. Speed upstream = $\frac{x}{4}$ km/hr

$\therefore$ Speed of boat in still water = $\frac{1}{2}(\frac{x}{2}+\frac{x}{4})$km/hr

Thus, combining statements I and II do not give the answer.