High School Algebra I Semester 1 Study Guide
High School Algebra I Semester 1 Study Guide
High School Algebra I Semester 1 Study Guide
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<strong>High</strong> <strong>School</strong> <strong>Algebra</strong> I<br />
<strong>Semester</strong> 1 <strong>Study</strong> <strong>Guide</strong><br />
24 Two trains leave the same station at the same<br />
time, traveling in opposite directions. The<br />
first train travels at 80 mph and the second<br />
train travels at 90 mph. In how many hours<br />
will the trains be 425 miles apart<br />
First, draw a diagram.<br />
80 mph station 90 mph<br />
n<br />
425 mi.<br />
24´ You Try.<br />
24) An airplane flies from San Francisco<br />
to New York at a speed of 350 mph and<br />
takes x hours. The return flight is at a<br />
speed of 300 mph and takes y hours. The<br />
flight from New York to San Francisco<br />
takes 1 hour longer than the flight from<br />
San Francisco to New York. How long<br />
does each flight take<br />
The distance the first train travels plus the<br />
distance the second train travels is equal to<br />
425 miles. But distance is rate • time. And<br />
the trains travel for the same amount of time.<br />
So:<br />
80 mph • x hrs. + 90 mph • x hrs. = 425<br />
The trains will be 425 miles apart in 2½ hours.<br />
15.0<br />
End of <strong>Study</strong> <strong>Guide</strong><br />
Page 16 of 19 MDC@ACOE (AUSD) 09/13/10
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