Two men started from the same place walk at the rate of 10kmph and 12kmph respectively. What time will they take to be 40 km apart, if they walk in the same direction?
Choose the correct choice from the following answers:
A) 5hours  B) 40hours  C) 8hours  D) 20hours  E) 30hours
To be 2km apart they take 1 hour   To be 10km apart they take = 1/2 * 40= 
<gadget id="calculator">1/2 * 40</gadget>
<output>20</output>
20 hours   Answer is 20hours
<result>D</result>
Two men started from the same place walk at the rate of 10kmph and 12kmph respectively. What time will they take to be 40 km apart, if they walk in the same direction?