Two men started from the same place walk at the rate of 5kmph and 5.5kmph respectively. What time will they take to be 8.5 km apart, if they walk in the same direction? Choose the correct choice.
A) 10hours  B) 12hours  C) 17hours  D) 15hours  E) 20hours
To be 0.5km apart they take 1 hour   To be 8.5km apart they take = 1/0.5 * 8.5= 
<gadget id="calculator">1/0.5 * 8.5</gadget>
<output>17</output>
17 hours   Answer is 17hours
<result>C</result>
Two men started from the same place walk at the rate of 5kmph and 5.5kmph respectively. What time will they take to be 8.5 km apart, if they walk in the same direction?