3.7

#include<iostream>

int main()
{
	using namespace std;

	const double One_hundred_kilometers_to_miles = 62.14;//100公里=62.14英里
	const double Gallons_to_liters = 3.875;//1加仑=3.875升
	
	float consumption_of_liter;

	cout << "Please enter the number of each hundred of kilometers that your car will consume: ";
	cin >> consumption_of_liter;
	float gallon_can_run = One_hundred_kilometers_to_miles / (consumption_of_liter / Gallons_to_liters);
	cout << "So each gallon can run  " <<gallon_can_run << " miles";

	return 0;

}