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chmorrisinco
#3 would be 16 inches of rain in 10 hours, since have 6 inches in 4 hours would mean 1 and a half inches per hour, whereas 16 inches in 10 hours would mean 1.6 inches per hour.
#1: 250 miles ever 10 gallons times 2 would be 500 miles ever 20 gallons so the 250 miles is greater than the 460 miles per 20 gallons.