Question 1115995
<pre>
               SPEED          TIME        DISTANCE

PART1          70              x          70x

PART2          60             6-x        60(6-x)

TOTAL                         6            380
</pre>


{{{highlight_green(70x+60(6-x)=380)}}}
Solve this for x, and that is the answer for the question.

-

{{{7x+6(6-x)=38}}}
{{{7x+36-6x=38}}}
{{{x=38-36}}}
{{{highlight(x=2)}}}----------hours spent at 70 m.p.h.