There is a coal truck with 50 cars. Each car is 10 meters long and 2.8 meters wide from the inside, and the coal inside is 1.6 meters high. If every 0.78 m3 coal weighs 1 ton, how many tons of coal are there? (1 decimal place is reserved for the result.)

10 × 2.8 × 1.6 × 50 ﹣ 0.78 × 1 = 28 × 80 ﹣ 0.78 = 2240 ﹣ 0.78 ﹣ 2871.8 (tons) a: these coal are 2871.8 tons in total

A coal train has 20 cars of the same size. Each car is 13 meters long, 2.5 meters wide, 2 meters high and 1.2 meters high,
If the weight of coal per cubic meter is 1.4 tons, how many tons of coal does this train transport? How many square meters of iron sheet are needed to build these cars?

It is 13 × 2.5 × 1.2 × 20 = 780 tons
The iron sheet is (13 × 2.5 + 13 × 2 + 2.5 × 2) × 2 × 20 = 2540 square meters

A coal train has 20 cars of the same size, each car is 13m long and 2.5m wide from the inside, and the height of coal loading is 1.2m
The weight of coal is 1.4 tons. How many tons of coal does this train transport? How many square meters of iron sheet are needed to build these cars?

The weight is 13 * 2.5 * 1.2 * 14 * 20 = 1092 tons
The surface area of the car is 13 * 2.5 + 2.5 * 2 * 2 + 13 * 2 * 2 = 94.5, if the car has an upper cover, add 32.5 = 127
The total iron sheet is 94.5 * 20 = 1890 square meters, if the car has an upper cover, it is 127 * 20 = 2540 square meters

There is a coal truck with 50 cars. Each car is 10 meters long and 2.8 meters wide from the inside, and the coal inside is 1.6 meters high. If every 0.78 m3 coal weighs 1 ton, how many tons of coal are there? (1 decimal place is reserved for the result.)