Femi and Hina are both travelling by train. Femi's train travels 120 km in 90 minutes. Hina's train travels 495 km. It leaves at 12:05 and arrives at 17:35. Work out the difference, in km/h, between the average speed of their trains. PLZ HELPPP

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0