A person can row 750 metres against the stream in 11 ¼ minutes and returns in 7 ½ minutes. Then the speed of the person in in still water is :	Choose the correct choice from the following:
A) 2 km/hr  B) 3 km/hr  C) 4 km/hr  D) 5 km/hr  E) 6 km/hr
The speed in upstream = .75 * (4/45 )*60= 
<gadget id="calculator">.75 * (4/45 )*60</gadget>
<output>4</output>
4 kmph   The speed in downstream= .75 *(2/15) *60= 
<gadget id="calculator">.75 *(2/15) *60</gadget>
<output>6</output>
6 kmph   Speed in still water= ½(4+6) = 5 kmph   ANSWER:5 km/hr
<result>D</result>
A person can row 750 metres against the stream in 11 ¼ minutes and returns in 7 ½ minutes. Then the speed of the person in in still water is :