Question 143062
Distance is 50. Distance = speed * time.
Let s = the speed of the local. Then 2s is the express.
Let the time for the express be t (in hours)

Given : {{{(2s*t) = (s*(t+1))}}}
{{{2t = t+1}}}
{{{t = 1}}}

50 = s*t = s*1 = s
Speed of express is 50
Speed of local is 25