Question 1197471
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A car covered a certain distance at a speed of 
24 mph. While returning, the car covered the same distance at a speed of 16 mph. What was the average speed of the car for the entire journey?
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A car covered a certain distance d at a speed of 
H mph. While returning, the car covered the same distance at a speed of L mph. What was the average speed of the car for the entire journey?
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<pre>
                 SPEED     TIME           DISTANCE

GOING              H        d/H              d

RETURNING          L        d/L              d

TOTALS                   d/H+d/L            2d
</pre>
Average speed for whole round trip,
{{{2/(1/H+1/L)}}}-----simplify this.  Substitute your given values and compute.






19.2  mph