Question 704916
{{{ d = r*t }}}
You want to work with just meters
( meters ) = ( meters/hr )*( hrs )
( hrs ) = ( meters ) / ( meters / hr )
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Also:
( km/hr )*( m/km) = (m/hr)
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{{{ 80*(1000/1) = 80000 }}} m/hr
and
{{{ 400 = 80000*t }}}
{{{ t = 400/80000 }}}
{{{ t = 4/800 }}}
{{{ t = 1/200 }}}
{{{ t = .005 }}} hrs
( sec/hr )*( hrs ) = (sec)
{{{ 3600*.005 = 18 }}}
It takes the car 18 sec to travel 400 m