A ferry crosses a lake and then returns to its starting point by the same route. The first time it crosses the lake, the ferry travels at \(15\) kilometers per hour. The ferry's return trip takes \(3\) hours. How many hours does the ferry take for the first leg of the trip?
1) The ferry’s average speed for the entire round trip is \(12\) kilometers per hour
2) The distance the ferry covers to cross the lake once is \(30\) kilometers
The OA is D