April 16 to May 25: 8 am to 5 pm. May 26 to September 4: 8 am to 6 pm. September 5 to September 30: 8 am to 5 pm. The North Rim Ranger Station is open periodically in the summer months. When closed, there is a self-pay station for the entrance fee and a self-registration board for wilderness permits.
at 17 knots the ship will travel how far in 9 minutes