Question 775609
The required time to make his trip is x, in hours.  When he is early using 4 km/hour, time is x-1/6.  When he is late at 3 km/hour time is x+1/6.  Whether early or late, the trip is the same distance.  


Traveling to school, rate*time=distance
10 minutes = 1/6 hour
Early:  {{{4(x-1/6)}}}
Late:  {{{3(x+1/6)}}}
Equal Distance:  {{{highlight(4(x-1/6)=3(x+1/6))}}}


{{{4x-2/3=3x+1/2}}}
{{{x-2/3=1/2}}}
{{{x=1/2+2/3=(3+4)/6=highlight(7/6)}}} hours
{{{x=1&1/6}}} hour
1 hour 10 minutes if he were to be "on-time".


HOW FAR FROM HOME TO SCHOOL?
Pick either early or late expression and compute the value.