Question

A man can row upstream at 8 kmph and downstream at 13 kmph.The speed of the stream is?
1. 2.5 kmph
2. 4.2 kmph
3. 5 kmph
4. 10.5 kmph

Answer 1

Speed of stream = (13-8)/2 = 2.5 km/h

Answer 2

Answer:

The speed of the stream is 2.5 kmph .

Option (1) is correct .

Step-by-step explanation:

Formula

$Speed\ of\ the\ stream = \frac{1}{2}[Downward\ stream\ speed - Upward\ stream\ speed]$

As given

A man can row upstream at 8 kmph and downstream at 13 kmph .

Put all the values in the formula

$Speed\ of\ the\ stream = \frac{1}{2}[13- 8]$

$Speed\ of\ the\ stream = \frac{5}{2}$

Speed of the stream = 2.5 kmph

Therefore the speed of the stream is 2.5 kmph .

Option (1) is correct .