a) The d stands for distance and t stands for time. As Distance = Speed x Time, 65 in this case would be the speed.
b) Distance = Speed x Time
d = 65 x 1.5 hours
Distance = 97.5 miles
c) Now we find t. Time = Distance/ Speed
t = 26/65
t = 0.4 hours
0.4 x 60 to get minutes
= 24 minutes