Will giveasap!

1) at 2: 00 p. m. two cars start toward each other from towns that are 240 miles apart. the rate of one car is 15 mph faster than the other. if the speed of the slower car is x, which of the following algebraic expressions represents the speed of the faster car?

15x
15-x
x+15

2) a train traveling 50 mph left a station 30 minutes before a second train running at 55 mph. if 55x represents the distance the faster train travels, which of the following algebraic expressions represents the distance of the slower train?

50(x + 0.5)
50(x-0.5)
50(0.5-x)