A 6th grade math application problem 20

Solution: The train crosses this bridge Total distance = bridge length + train length Total distance - train length = bridge length.

Total distance: 75 km = 75,000 m , 2 minutes = 1 30 hours.

75000 1 30 = 2500 (meters).

Train length: The length of the train should be equal to the locomotive and the spacing between the carriages, and the spacing between the 36 carriages is 1 meter, and the total spacing is 35 meters.

36 30 + 35 = 1115 (m).

Bridge length: 2500-1115=1385 (meters) Answer: The total length of the bridge is 1385 meters.

Solution: The length of the bridge is xkm

Train length s=36*30+(36-1)*1=1115m=;

The distance traveled by the train when crossing the bridge l=s+x=;

The distance traveled by the train during this time is l=75*2 60=;

So we get the equation l=;

Solution x = A: The length of this bridge is.

The length of the bridge is x meters, the length of the body of 36 knots is 36 30 1080 meters, and the distance between the knots is 1080 + 35 1115 meters, so the column equation: x + 1115 75 1000 2 60

Solved: x 1385 meters.

36 times 30 plus 35 times 1 = 1115 meters.

75 times 1 30 = km = 2500 meters.

2500 m - 1115 m = 1385 m.

1. The total length of the whole train: 30 * 36 + 35 = 1115 meters.

2. The speed of this train per minute: 75 60 = km/h.

km = 1250 meters.

3. The total length of the body and the bridge: 1250 * 2 = 2500 meters.

4. The total length of the bridge: 2500-1115=1385 meters.

Hope it helps!

Since the train passes through this bridge completely, the distance traveled in two minutes is the length of the bridge plus the length of the train.

2 minutes = 2 60 hours.

The length of the train: 30x36 + 29 = 1109 meters, the distance traveled by the train: 75x2 60 = meters.

So the length of the bridge = 2500-1109 meters = 1391 meters.

There are 36 gaps in 35 knots, so the length of the car is:

36 30 + 35 = 1115 (m).

2 60 * 75 * 1000-1115 = 2500-1115 = 1385 (m).

person) 15 * 10 = 150c

10000/150*10=2000/3(g)3.These two prime numbers must be one odd and one even, so one of them is 2 and the other is 1999Then 2*1999=3998

Question 1:

54 6 35 = 315 (person).

Answer: "There are 315 people in total. ”

Question 2: 15*10=150

1㎡=10000c㎡

10000 150*10=2000 3 (grams) Answer: "1 nylon cloth weighs 2000 3 grams. ”

The third question: 2001=2+1999

Answer: "The product of two prime numbers is 3998."”

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