John drove from his home to the beach 150 miles away and drove home at the end of the day. If he drives at an average speed of 50 miles per hour, how long will it take to get back and forth?

A: 3 hours B: 2 hours C: 6 hours D: 5 hours

What is the slope of 3x+4y = 24?

A: -3/4 B: 6 C: 3/4 D: -8