CAT queries

Solve queries based on quantitative ability

How can I solve question 33(ii)

A soldier is going towards a port at a uniform velocity of 5km/h. From the port at an interval of 12min a sender comes to give information to the soldier at an uniform velocity of 10km/h. At which time interval the soldier gets information? 

A) 8min. B)12min  C)6min D)None