The highway from city a to city B is 160 km long. The speed of a car on the expressway is 80 km / h, and that on the ordinary highway is 40 km / h. how much time does it save to take the expressway from city a to city B?

160 △ 40-160 △ 80, = 4-2, = 2 (hours); a: Taking the expressway from city a to city B saves 2 hours compared with the ordinary highway

It took eight hours for the car to travel from land a to land B, and the fuel consumption was 48 liters. When it returned to land a, the speed was only 80% of the time, and it consumed 10% more fuel per hour. How much fuel did it consume when it returned
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66 liters. The speed is only 80%, so it takes 10 hours. Because it consumes 6 liters per hour when going, it should be 6.6 liters per hour when coming back. It takes 10 hours, and it takes 66 liters in total

It took eight hours to travel from land a to land B, and the fuel consumption was 48 liters. Due to many uphill roads, the speed of returning to land a was only 80% of that of the past, and the fuel consumption was 10% more per hour
What is the fuel consumption on return?

66 liters
1. Return time: 8 hours / 80% = 10 hours,
2. Original oil consumption per hour: 48 L / 8 h = 6 L
3. Return oil per hour: 6 L x 110% = 6.6 L
4. Return oil: 6.6l x 10h = 66l

When a truck drives at an average speed of 48 km / h for 1.2 hours, it consumes 3.84 liters of fuel. How many liters of fuel is consumed per kilogram

Distance: 48 × 1.2 = 57.6km
Fuel consumption = 3.84 △ 57.6 = 1 / 15 l

The highway from city a to city B is 160 km long. The speed of a car on the expressway is 80 km / h, and that on the ordinary highway is 40 km / h. how much time does it save to take the expressway from city a to city B?