Question 793383
CAR_____________speed_____________time________________distance
Slow____________40________________(___)_______________15
Fast____________50_______________(___)________________15


Fill in the missing time quantities of each car using {{{r*h=d}}}, where h is for time in hours.  We have a formula from this, {{{h=d/r}}}.


CAR_____________speed_____________time________________distance
Slow____________40________________(15/40)_______________15
Fast____________50_______________(15/50)________________15


The fast car spent less time driving to arrive at school.  Upon his arrival, the slow car is still traveling, and the fast car then waits 15/40-15/50 hour for the slow car to arrive.


{{{15/40-15/50}}}
{{{(5/5)(15/40)-(4/4)(15/50)}}}
{{{(5*15/200-4*15/200)}}}
{{{(75-60)/200}}}
{{{15/200}}}
Divide by {{{(5/5)}}},


{{{3/40}}}


{{{(3/4)/10}}}


{{{0.75/10}}}


{{{highlight(0.075)}}} hours


A better unit is as MINUTES:
{{{0.075*60=highlight(4.5)}}} minutes