A person can row at 10 kmph in still water. If the velocity of the current is 2 kmph and it takes him 15 hour to row to a place and come back, how far is the place?	Choose the correct choice from the following choices.
A) 24km B) 30km C) 48km D) 72km E) 15km
Speed of down stream = 10+2= 
<gadget id="calculator">10+2</gadget>
<output>12</output>
12kmph   speed of upstream= 10-2= 
<gadget id="calculator">10-2</gadget>
<output>8</output>
8kmph   Let the required distance be xkm   x/12 + x/8= 15   2x+3x = 360   x = 72 km   Answer is 72km
<result>D</result>
A person can row at 10 kmph in still water. If the velocity of the current is 2 kmph and it takes him 15 hour to row to a place and come back, how far is the place?