Anything to the power of 0 is just 1
Try this option:
1 meter=1000 mm; 1 hour=60 min. From another side: 1 mm=0.001 m. and 1 min=1/60 h.
Using this rule:
620 mm/h=0.06*620 m/h=37.2 meters per hour.
answer: 0.06
To get that, you have to multiply the both numbers, which is 24*12=288
So what does it want you to what’s the equation