What is the driving distance from slippery rock pa to ocean city Maryland?

428 miles taking this route:

1. Take I-79 SOUTH, from Slippery Rock, to I-76 Pennsylvania TURNPIKE (toll road) - EAST to HARRISBURG at EXIT 77.
2. Take I-76 EAST, on the PENNSYLVANIA TURNPIKE, to I-70 EAST to BALTIMORE at EXIT 161, which is the BREEZEWOOD exit.
3. Take I-70 EAST to I-695 SOUTH at EXIT 91A in Maryland.
4. Take I-695, around BALTIMORE, to I-97 SOUTH to ANNAPOLIS and the BAY BRIDGE at EXIT 4.
5. Take I-97 SOUTH to U.S. 50 EAST to ANNAPOLIS and the BAY BRIDGE.
6. Take U.S. 50 EAST to Ocean City.