Heledd is the captain of a cargo ship. She is planning her next voyage.

The last time the cargo ship was unloading sand in port
B
, it took 3 cranes 45 hours to unload 250000 tonnes of sand.

Port
B
now has 5 cranes.
Calculate the time it will take 5 cranes to unload 300000 tonnes of sand.

You can assume that all cranes unload sand at the same rate, and that all other conditions remain the same.

Give your answer in hours and minutes.