47. Two ships leave a port at the same time. One ship moves at 20 miles per hour and sails 2 hours north, and then 1 hour east. The other ship moves at 25 miles per hour and sails 2 hours east, and then 1 hour north. Which of the following is an expression for the number of miles apart the ships are 3 hours after they leave port?

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

From the meaning of the question, we can know the final distance between the two ships. The first ship first traveled northward at 20miles/h for 2h, 40miles, and then traveled eastward at the same speed for 1h, 20miles. A ship travels eastward at 25miles/h for 2h, and then travels northward at the same speed for 1h, so choose B.