Question 1166628
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A tourist can bicycle 39 miles in the same time as he can walk 9 miles. If he can ride 10 mph faster than he can walk, how much time should he allow to walk a 35-mile trail?
9 mi39 mi
Two images are displ,...
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The problem description seems the same as another one answered yesterday or day before.

<pre>
            SPEED         TIME       DISTANCE

BIKE        r+10          39/(r+10)     39

WALK         r            9/r            9
</pre>
The two time quantities were given as equal.


{{{39/(r+10)=9/r}}}

-

{{{13/(r+10)=3/r}}}

{{{13r=3r+30}}}

{{{10r=30}}}

{{{highlight_green(r=3)}}}---walking speed
-
{{{3+10=highlight_green(13)}}}----bicycling speed



The question is, how much time to do 35 miles by walking?

{{{(35*miles)/(3(miles/hour))}}}


{{{(35/3)hours}}}

{{{11&2/3}}}{{{hours}}}