A ship travelling due east sights a lighthouse at N 61°33' E. After 2 hours and 48 minutes, the ship reaches a rock that the map says is 45 km due south of the lighthouse. How fast is the ship travel

A ship travelling due east sights a lighthouse at N 61°33' E. After 2 hours and 48 minutes, the ship reaches a rock that the map says is 45 km due south of the lighthouse. How fast is the ship travelling, in km/h?

Round answer to 3 decimal places.

(plz help ASAP)