Not too sure here but the area traveled should be the area under the graph which would be 5*3*4=60cm per second. 60 seconds in a minute so 60*60cm traveled kn a minute. Answer should be 3600cm
For 28, I said that the total force in one half of the rope is (5*0.8)+(5*10)=54. Then I said 54*2=108 since the rope must have equal tensions on both sides but I'm not too sure here. Maybe someone else can clarify here.
36- can't make head nor tail how to do this.
That's what I have done- can't say whether it's right but I hope I've helped. If Ive not explained something properly, do ask...