Answer :

SmarticalParticals
Ok, the table is as follows:

               rate(mi/h)  Time(h)    Distance(mi)
To work      55              t                55t

To home     40                                ?


The distance is going to equal the rate * time.  Since we have the rate of the commute home, we need the time in order to find the distance.  They give us a time of 1.25 hours for the round trip to work and back home.  Since the time to work is t... then that means the time home is 1.25 - t.  Since the distance is the rate * time, then

distance = 40(1.25 - t)

So the expression to fill in the missing distance is...

40(1.25 - t)

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