Help! How do you do problems like these? Please tell me the actual process in doing them..Not just the answer! Thank you sooo much!

1. An airplane travels at a constant speed, relative to the ground, of 900.0km/h.

a) How far has the airplane traveled after 2.0 hours in the air? (It is 1800 because 900x2.0+0?)

b) How long does it take for the airplane to travel between City A and City B if the cities are 3240 km apart? (What equation do I use for this?)

c) If a second plane leaves 1 hour after the first, and travels at 1200 km/h, which flight will arrive at City B first?

2. You and your friend start jogging around a 2.00x10^3-m running track at the same time. Your average running speed is 3.15m/s, while your friend runs at 3.36 m/s. how long does your friend wait for you at the finish line? (HELP!!)

3. An antelope can run 90.0 km/h. A cheetah can run 117 km/h for short distances. The cheetah, however, can maintain this speed only for 30.0s before giving up the chase.

a) Can an antelope with a 150.0-m lead outrun the cheetah? (How do I set up this equation?)

b) What is the closest that the antelope can allow a cheetah to approach and remain likely to escape?

thank you thank you thank you thank you!!!!!!!!