Hi guys, having trouble with this math question and hoping you could help!

What is the time needed to plough this field with a) the old tractor and b) the new tractor:

- The area of the field is 100 m x 100 m square

- The width that both tractors can plough is 100 cm wide

- The speed is 0.5 hectare per hour for the old mower

- The speed is 1 hectare per hour for the new mower

Can you guys help me with the working out as well as the answer?