15 cm/4 hours
= 3.75 centimeters per hour
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It is: 4 to 3
20 cm x 15 cm = 300 cm2
If 15 cm is the diameter then circumference is pie x diameter which is 3.14 x15
The length is 20 cm.
Convert everything to the same unit; then you can easily compare. As a reminder, 1 cm = 10 mm.