Fewpal
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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. 

a) I alone sufficient while II alone not sufficient to answer 

b) II alone sufficient while I alone not sufficient to answer 

c) Either I or II alone sufficient to answer 

d) Both I and II are not sufficient to answer 

e) Both I and II are necessary to answer 

1 Answer

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Best answer

Correct option: e) Both I and II are necessary to answer

Explanation:

Let thw speed of the boat in still water be x kmph. Then, (4/(x+1))+(4/(x-1))=3. This gives x value. So correct ans is e

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