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Question

What is the downstream speed of the boat?

Statement I: The speed of the boat is 15 km/hr.

Statement II: The boat rows up a river 30 km in 6 hours.

A If the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question. Correct Answer Incorrect Answer
B If the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question. Correct Answer Incorrect Answer
C If the data in both statement I and II together are required to answer the question. Correct Answer Incorrect Answer
D If the data either in statement I alone or in statement II alone is sufficient to answer the question Correct Answer Incorrect Answer
E If the data even in both the statement I and II together are not sufficient to answer the question. Correct Answer Incorrect Answer

Solution

we know that speed = distance/Time From statement II: Upstream speed = 30/6 = 5 km/hr From both I and II, Speed of boat = 1/2 (Downstream + upstream speed) 15 = 1/2 (downstream + 5) 30 = downstream +5 Downstream speed = 25 km/hr Therefore, both statement I and statement II together are necessary to answer the question.

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