Boats and Streams - Arithmetic Aptitude Questions and Answers

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What is the speed of the boat in still water?

I. The speed downstream is 12 kmph.

II.The speed upstream is 4 kmph.

III.In a to and fro journey between two points, the average speed of the boat was 6 kmph.

I and II only

All I, II and III

III, and either I or II

Any two of the three

None of these

Answer : Option D

Explanation :

From I and II, speed of boat in still water =	1	(12 + 4) km/hr = 8 km/hr.
	2

From II and III, we get:

Using average speed= $\frac { 2XY } { X+Y }$ ,we get: $\frac { 2*4*Y} {4+Y} =6$

y = 12.

Required speed = $\frac { 1 } { 2 }$ (12 + 4) km/hr = 8 km/hr.

Similarly, I and III also give the answer.

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