A boat takes 3 hours to travel from place M to N down stream and back from N to M upstream. If the speed of the boat instill water is 4 km/hr, what is the distance between the two places? Choose the correct choice from the following answers: A) 8 km B) 12 km C) 6 km D) Data inadequate E) None of these
Let the distance between M and N and the speed of current in still water be d km and x km/hr respectively.   According to the question, d/4+x+d/4−x=3   In the above equation we have only one equation but two variables, hence, can’t be determined.   Answer Data inadequate
<result>D</result>
A boat takes 3 hours to travel from place M to N down stream and back from N to M upstream. If the speed of the boat instill water is 4 km/hr, what is the distance between the two places?