Question 966938
Set t equal to the time spent of the first visit.
1.5*t is the time for the second visit
1.5*1.5*t is the time for the third visit
1.5*1.5*1.5*t is the time for the fourth visit.
t + 1.5*t + 1.5*1.5*t + 1.5*1.5*1.5*t = 135 minutes
t + 1.5t + 2.25t + 3.375t = 135
(1+1.5+2.25+3.375)t = 135
8.125t = 135
divide each side by 8.125 to give us the time of the first visit
t = 135/8.125
The length of the fourth visit is {{{3.375*(135/8.125)}}}
which is approximately 56.07 minutes