Temperature difference is required, so i’m guessing - a. thermometer - would be required to check that temperature.
Average speed = total distance / time ⇒ total distance = average speed * time
Average speed = 270 km / p hours
distance = d
hours = x
d = 270/p * x
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<span>Most of the earth's fresh water is stored as ice in the Arctic and Antarctic regions of the globe.</span>