<PRE><B>Question 466446</B>
Get the logic right

time taken from chicago to LA was more by 48 minutes = 4/5 hours

Let the distance between LA and chicago be x

t= d/r
time to chicago = x/640 hours

time to LA = x/512 

Time to LA - Time to chicago = 4/5 

x/512 - x/630= 4/5

630x-512x= 4*630*512 /5

118x= 4*126*512

x= 4*126*512/118
x= 2186.8 miles 

Time to LA = 2186.8/512

4.2 hours

CHECK

Time to chicago = 2186.8 / 640
= 3.42 hours
4.27-3.4= 0.8 hours </PRE>