Can someone please help me with this if you get it right I will mark you

Will give brainliest if you answer question correct

What is the y-intercept of the line given by the equation

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?