uniform distribution for probability The city needs to perform some road maintenance and will rent excavator machines from a company.   Each excavator will work for at least one hour and no more than $4$ hours in a day.   The working time is evenly distributed.
Given that a excavator has already worked for $2.5$ hours what is the probability that it will work at least $1$ more hour?

I know that its a uniform distribution, I just do not know how to solve the questions, I know I am looking for $\mathsf P(P&gt;3.5 \mid P&gt;2.5)$ but I do not know how to solve it.
As we have 
P (A|B)=P [A,B]/P (B)
I,e
      P [x>3.5|x>2.5]=P [x>3.5,x>2.5]/P [x>2.5]
                               =P [x>3.5]/P [x>2.5]
since intersection of [x>3.5,x>2.5]=[x>3.5]
As we have 
P (A|B)=P [A,B]/P (B)
I,e
      P [x>3.5|x>2.5]=P [x>3.5,x>2.5]/P [x>2.5]
                               =P [x>3.5]/P [x>2.5]
since intersection of [x>3.5,x>2.5]=[x>3.5]