You can put this solution on YOUR website! Your proportion should always have the units in the same place in both terms for example in this situation: miles/time = miles/time
Plug in what you know from the word problem:
25miles/1hour = 50miles/'x'hours
CROSS MULTIPLY
25x=50
Divide both sides by 25 to get x alone
x=2
Don't forget the units that the question is asking for. 2 hours