A man rows down stream 40 km and upstream 21 km taking 4 hrs each time. what is the velocity of current?	Select the correct option:  A) 2.735 Kmph  B) 2.375 kmph  C) 2. 573 kmph  D) 2 kmph  E) None of these
Explanation:   Man's rate downstream = 40/4= 
<gadget id="calculator">40/4</gadget>
<output>10</output>
10 Kmph   Man's rate upstream= 21/4= 
<gadget id="calculator">21/4</gadget>
<output>21/4 = around 5.25</output>
5.25 Kmph   Velocity of current= 1/2( 10 - 5.25)   = 2.375 Kmph   Answer: Option 2.375 kmph
<result>B</result>
A man rows down stream 40 km and upstream 21 km taking 4 hrs each time. what is the velocity of current?