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If the fuel tank of a car is filled with 45 liters of gasoline at a time, it is feasible to drive y km. Suppose that the car consumes x liters of fuel every 100 km, then the analytic function of Y with respect to X is______ ．
∵ a car consumes x liters of fuel every 100 kilometers, 1 liter of gasoline can travel 100x kilometers, y = 45 × 100x = 4500X
Xiaoning walked 3 / 5km in 1 / 6 hour. At this speed, how many kilometers does he walk in 1 hour? How many hours does it take for him to walk 1km?
What's the formula
Speed = (3 / 5) / (1 / 6) = 3 / 5 * 6 = 18 / 5 = 3.6
He walked 3.6km an hour
Time = 1 / 3.6 = 5 / 18 hours
The flow velocity of a river is 2.5km/h. If the ship's velocity in still water is x km / h, the downstream velocity is 0.5km/h___ The upstream velocity is____
X+2.5km/h
X-2.5km/h
The railway is 675.5km long, 80.5km per hour, and the speed is 5 hours. The rest will arrive in 3.25 hours. How many kilometers per hour
Let x km / h be the rest
80.5x5+3.25X=675.5
The solution is: x = 84
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