<PRE><B>Question 951503</B>
d=distance; t=time for trip
d/35mph-d/45mph=11 min(1hr/60min)
d(1/35mph-1/45mph)=11/60 hr Divide each side by (1/35mph-1/45mph
d=(11/60 hr)/(1/35mph-1/45mph)
d=29.1 mi 
29.1 mi/35mph+29.1mi/45mph=t
0.831 hr+0.647 hr=1.478 hr ANSWER: The trip took 1.478 hours.
CHECK
29.1mi/35mph-29.1mi/45mph=11 min
0.831 hr-0.647hr=11 min
0.184 hr(60 min/1 hr)=11 min
11 min=11 min</PRE>