Question 621378
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
Train A leaves the platform at 5 pm at a speed of 120 km/h and train B leaves the same platform 
on a parallel track in the same direction at 7 30 pm at 144 km/h. 
After how many hours{{{highlight(x)}}} will train B cross train A?
 D = rt
 Distance = Distance
 {{{144kmh*x = 120kmph*(x+2.5hr)}}}
solving for x
  x = {{{120*2.5/24}}}