Speed of a boat in still water is 5 km/hr and speed of the stream is 2 kmph. A man rows to a place at a distance of 252 km and comes back to the starting point the total time taken by him is.  Choose the correct choice:
A) 160 hr  B) 200 hr  C) 120 hr  D) 140 hr  E) 180 hr
Explanation:   Speed up stream = 5 - 2= 
<gadget id="calculator">5 - 2</gadget>
<output>3</output>
3 km/hr   Speed down stream= 5 + 2= 
<gadget id="calculator">5 + 2</gadget>
<output>7</output>
7 km/hr   Total time taken= 252/3 + 252/7 = 84 + 36= 
<gadget id="calculator">84 + 36</gadget>
<output>120</output>
120 hr   Answer: Option 200 hr
<result>B</result>
Speed of a boat in still water is 5 km/hr and speed of the stream is 2 kmph. A man rows to a place at a distance of 252 km and comes back to the starting point the total time taken by him is.