Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and
A boat takes a total time of three hours to travel downstream from P and Q and upstream back from Q to P. What is the speed of the boat in still water?
I. The speed of the river current is 1 km per hour.
II. The distance between P and Q is 4 km.

I alone sufficient while II alone not sufficient to answer

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II alone sufficient while I alone not sufficient to answer

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Either I or II alone sufficient to answer

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Both I and II are not sufficient to answer

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Both I and II are necessary to answer

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Solution

The correct option is E Both I and II are necessary to answer
I. Speed of the current = 1 km/hr.
II. PQ = 4 km.
Let the speed of the boat in still water be x km/hr. Then,
$\frac{4}{(x + 1)} + \frac{4}{(x - 1)} = 3$ This gives x
$∴$ Correct answer is (E).

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The correct option is E Both I and II are necessary to answerI. Speed of the current = 1 km/hr.II. PQ = 4 km.Let the speed of the boat in still water be x km/hr. Then,4(x+1)+4(x−1)=3 This gives x∴ Correct answer is (E).

The correct option is E Both I and II are necessary to answer
I. Speed of the current = 1 km/hr.
II. PQ = 4 km.
Let the speed of the boat in still water be x km/hr. Then,
$\frac{4}{(x + 1)} + \frac{4}{(x - 1)} = 3$ This gives x
$∴$ Correct answer is (E).