<PRE><B>Question 960721</B>
A man drove at the rate of 50 km an hour while outside a city and 30 km an hour while within the city. If a trip of 33 km took him 54 minutes, how much of the trip was outside the city?
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let x=distance traveled outside the city
33-x=distance traveled within the city
travel time=distance/speed
54 min=54/60=9/10 hr
..
{{{9/10=x/50+(33-x)/30}}}
lcd:150
135=3x+165-5x
2x=30
x=15
how much of the trip was outside the city? 15 km</PRE>