Question 245
..Using SPEED(s)=DISTANCE(D)/time(t)



...Make Distance the subject



Then,let D1=st....distance eastward



And D2=st



..So substitute speed



..D1=540t and D2=720t



..because they are 1890 apart,so we say D1+D2=1890



Hence; 540t+720t=1890



..1260t=1890



..T=1890/1260



..T=1.5....meaning...one and a half hour.







ULTIMATE44