The quotient of 12 divided by 3 less than 15

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

How can i differentiate this equation?

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?