Two cities X and Y are 700 km apart. X to Y is a downstream journey on a stream which flows at a speed of 5 km/hr. Two boats A and B run to and fro between two cities. Speed of Boat A, which starts from city X is 45 km/hr, while speed of boat B, which starts from city Y at the same time is 25 km/hr. After how much time will two boats meet for the second time?

• A. 14 hours
• B. 28 hours
• C. 15 hours
• D. 30 hours