A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a plce and come back, how far is the place? Select
A) 2 km	B) 2.4 km	C) 2.5 km	D) 3.4 km	E) None
Sol.   Speed downstream = (5+1)= 
<gadget id="calculator">(5+1)</gadget>
<output>6</output>
6 kmph; Speed upstream= (5 - 1)= 
<gadget id="calculator">(5 - 1)</gadget>
<output>4</output>
4 kmph. Let the required distance be x km.   Then, x/6 + x/4= 1 ⇔ 2x + 3x = 12 ⇔ 5x = 12 ⇔ x = 2.4 km.   Answer 2.4 km
<result>B</result>
A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a plce and come back, how far is the place?