Question 1142950
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Castel drove to the lake and back. It took three hours less time to get there than it did to get back. The average speed on the trip there was 70 km/h. The average speed on the way back was 28km/h. How many hours did the trip there take? 
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<pre>
            SPEED      TIME    DISTANCE

TO LAKE       70        x-3      d

RETURN        28        x        d
</pre>

Distance each way is the same.  Basic RT=D formula and the equal distance each way allow the equation  {{{70(x-3)=28x}}}.


{{{10(x-3)=4x}}}
{{{10x-30=4x}}}
{{{6x=30}}}
{{{x=5}}}


That is for the TRIP GOING BACK HOME.


Trip time TO the lake was:
{{{x-3}}}
{{{5-3}}}
{{{highlight(2)}}}