Two men starting from the same place walk at the rate of 5 kmph and 5.5 kmph respectively. What time will they take to be 8.5 km apart, if they walk in the same direction?	Select the correct option:
A) 12 hrs B) 14 hrs C) 15 hrs D) 17 hrs E) None
Sol.   to be 0.5 km apart, they take 1 hour.   To be 8.5 km apart, they take [1/0.5 * 8.5= 
<gadget id="calculator">1/0.5 * 8.5</gadget>
<output>17</output>
17 hrs.   Answer 17 hrs
<result>D</result>
Two men starting from the same place walk at the rate of 5 kmph and 5.5 kmph respectively. What time will they take to be 8.5 km apart, if they walk in the same direction?