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Doctors Medicines MCQs Q&A

  1. All the statements are required to answer the question.
  2. Any two statements are sufficient to answer the question.
  3. Either statement I or II and statement III are required to answer the question.
  4. Statement I and III together are sufficient to answer the question.
  5. Statement II and III together are sufficient to answer the question.
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1 Answers

Option 3 : Either statement I or II and statement III are required to answer the question.

Suppose the speed of the boat in still water and speed of the current is ‘a’ and ‘b’, respectively and the distance covered upstream is D;

Statement I:

2D/(a + b) = D/(a - b)

⇒ a + b = 2a - 2b

⇒ a = 3b        ---- (1)

Statement II:

Speed of the boat in still water is three times the speed of the current;

∴ a = 3b        ---- (2)

Here, we can see that Statements I and II both are giving the same information.

Statement III:

The boat goes 840 meters in 1 hour 10 minutes i.e. 70 minutes downstream;

∴ (a + b) × 70 = 840

⇒ (a + b) = 12

Now, with the help of statement 1 or 2, we can get the value of ‘a’ i.e. the speed of the boat.

∴ Either statement I or II and statement III are required to answer the question.
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