If you would like to know how far did the man travel, you can calculate this using the following steps:
an hour and a half ... 1 1/2 hours = 3/2 hours
3/2 hours ... x miles = ?
1 hour ... 8 miles
3/2 * 8 = 1 * x
x = 3/2 * 8
x = 12 miles
55 miles ... 1 hour = 60 minutes
y miles = ? ... 24 minutes
60 * y = 55 * 24
y = 55 * 24 / 60
y = 22 miles
x + y = 12 miles + 22 miles = 34 miles
The correct result would be 34 miles.