Answer:
120.00 person for the first 30 minutes
+ 50.00 for first 10 minutes extension
+ 50.00 for 2nd 10 minutes extensions
+ 50.00 for 3rd 10 minutes extension
270.00 = total horse ride cost
So,
30 minutes
+10 minutes (1st extension)
+10 minutes (2nd extension)
+10 minutes (3rd extension)
60 minutes or 1 hour = the total number of hours spent on the ride.