Question 1148730
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A pilot takes a trip to visit relatives. The trip there at a speed of 100 miles per hour. On the way back home, the pilot travels at 80 miles per hour. If the round trip took nine hours, how far did the pilot travel to visit her relatives?
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<pre>
                  SPEED     TIME         DISTANCE

GOING THERE        100       d/100          d

CAME BACK           80       d/80           d

TOTAL                         9
</pre>
{{{d/100+d/80=9}}}

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{{{(d*80+d*100)/8000=9}}}

{{{d(180/8000)=9}}}

{{{d=9(8000/180)}}}

{{{d=9(800/18)}}}

{{{d=800/2}}}

{{{highlight(d=400)}}}