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The following question has three statements. Study the question and the statements and decide which of the statement(s) is necessary to answer the question. How much time does a boat take to cover a distance of 45 km travelling downstream? I) The speed of the stream is 3 km/hr. II) The speed of the boat in still water is 12 km/hr. III) The boat can cover the downstream distance of 33.75 km in 2 hrs. 15 min.

The following question has three statements. Study the question and the statements and decide which of the statement(s) is necessary to answer the question. How much time does a boat take to cover a distance of 45 km travelling downstream? I) The speed of the stream is 3 km/hr. II) The speed of the boat in still water is 12 km/hr. III) The boat can cover the downstream distance of 33.75 km in 2 hrs. 15 min. Correct Answer Either (I) and (II) or (III)

Considering statement (I),

Speed of stream = 3 km/hr

Considering statement (II),

Speed of boat in still water = 12 km/hr.

Using information from (I) and (II),

Downstream speed = (speed of stream) + (speed of boat in still water) = 3 + 12 = 15 km/hr.

Time taken to cover 45 km downstream = 45/15 = 3 hrs.

Considering statement (III),

Downstream speed = 33.75/2.25 = 15 km/hr

Time taken to cover 45 km downstream = 45/15 = 3 hrs.

∴ The question can be answered using either (I) and (II) or only (III)

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