Question 1066378
<pre>
t, normal expected time
d, one-way trip distance


                    SPEED      TIME       DISTANCE

LATE                40         t+1         d

EARLY               48         t-1         d
</pre>


Solve this system:
{{{system(40(t+1)=d,48(t-1)=d)}}}



-
{{{40(t+1)=48(t-1)}}}
{{{5(t+1)=6(t-1)}}}
{{{5t+5=6t-6}}}
{{{highlight(t=11)}}}-------normally expected time


Q1:
Find d.
{{{40(t+1)=d}}}
{{{40(11+1)}}}
{{{40*12}}}
{{{highlight(480*kilometers)}}}


Q2:
What should be the expected speed for the bus if the 480 km trip took 11 hours?
{{{r*11=480}}}
{{{r=480/11}}}
{{{r=44(kilometer/hour)}}}