Question 1161107
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<pre>

Let x be the Khang' speed, in miles per hour.

Then the Hector' speed is 0.7x miles per hour.


The basic equation is

    3x + 3*0.7x = 30.6  miles.


Simplify and solve it

    3x + 2.1x   = 30.6

    5.1x        = 30.6

       x        = {{{30.6/5.1}}} = 6.


<U>ANSWER</U>.  Khang' speed is 6 mph;  Hector' speed is  0.7*6 = 4.2 mph.
</pre>

Solved.


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