Home / Arithmetic Aptitude / Boats and Streams :: Discussion

### Discussion :: Boats and Streams

1. 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.

2.  A. I and II only B. All I, II and III C. III, and either I or II D. Any two of the three E. None of these

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.

Be The First To Comment