Factor completely : 36c^2– 121d^2

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?

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2

Zack and tia played chess for 50 min they put the chessboard away at 11: 20 when did they start