Question 1121630
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<pre>
Let x = "how fast did he drive in the morning".


Then his speed after lunch was (x+10) mph.


The equation is


5x + (10-5)*(x+10) = 450  miles.


5x + 5*(x+10) = 450

5x + 5x + 50 = 450

10x = 450-50 = 400   ====>  x = {{{400/10}}} = 40 miles per hour was his speed in the morning.
</pre>

Solved.


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