Question 1033137
There are {{{ 2*pi }}} radians in a circle, so
[ rad / min ] / [ rad / rev ] = [ rev / min ]
{{{ 500 / (2*pi ) = 500 / 6.2832 }}}
{{{ 500 / 6.2832 = 79.5775 }}} rev/min
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The wheel travels a horizontal distance of cm
one circumference in one revolution, so
Let {{{ C }}} = circumference in cm
{{{ C = 2*pi*170 }}}
{{{ C = 6.2832*170 }}}
{{{ C = 1068.1415 }}} cm / rev
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[ rev / min ] x [ cm / rev ] = [ cm / min ]
{{{ d = 79.5775*1068.1415 }}}
{{{ d = 85000 }}} cm / min
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[ cm / min ] x [1 m / 100 cm ] x [ km / 1000 m ] = [ km / min ]
{{{ 85000*( 1/100 )*( 1/1000 ) = .85 }}} km/min
[ km/min ] x [ min/hr ] = [ km / hr ] 
{{{ .85*60 = 51 }}}
The wheel moves horizontally 51 km/hr
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Get a 2nd opinion & check the math
I could easily mess this up