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Carla and Patrick rode their bikes for the same amount of time.
Carla rode at 8 miles per hour, and Patrick rode at 4.5 miles per hour.
If Carla rode 2.63 miles farther than Patrick, how Long did they use the bikes?
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Pay attention on how I edited your post in order for it makes sense.
Your equation is THIS :
Distance Carla rode - distance Patrick rode = 2.63 mile, or
8*t - 4.5t = 2.63
where t = "How Long did they use the bikes" is the unknown amount of time under the question.
8t -4.5t = 2.63
3.5t = 2.63
t = = 0.751429 hours.