Two rafts are traveling In opposite directions on a straight river. The raft going with the current is traveling at a speed of 12 mph. The raft going against the current is traveling at a speed of 70 miles per hour. Both rafts travel the river for two hours. Which equation represents the situation? Assume the raft traveling with the current travels X miles in the raft traveling against the current travels y miles. A. 12/x - 7/y = 1/2 B. 12x + 7y = 2 C. x/12 - y/7 = 2 D. x/12 + y/7 = 4 E. 12x + 7y = 4

• CastleRook: Time =(distance)/speed
  Time taken by the raft going with the current to travel x miles is:
  12/x hours
  Time taken by the raft going against the wind is:
  7/y
  Total time taken for both raft is 4 hours thus:
  12/x+7/y=4
  hence the answer is:
  D. x/12 + y/7 = 4