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It takes 52 seconds for a train to pass through a 320 meter long tunnel. When it passes through an 864 meter long bridge, its speed is higher than when it passes through the tunnel It takes 52 seconds for a train to pass through a 320 meter long tunnel. When it passes through a 864 meter long bridge, its speed is 1 / 4 higher than that when it passes through the tunnel. As a result, it takes 1 minute 36 seconds? I've been thinking for a long time. Wuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwuwu To calculate, equation XY has not been taught. Besides, it's arithmetic control.
1 minute 36 seconds = 96 seconds
Train speed through tunnel = (864-320) ÷ (96) × 5 / 4-52) = 544 ÷ 68 = 8 (M / s)
Train length = 8x52-320 = 416-320 = 96 (m)
A: omitted
It takes 52 seconds for a train to pass through a 320 meter tunnel, and 120 seconds for it to pass through an 864 meter bridge. Find the speed of the train and the speed of a train to pass through 320 meters? C emergency
This thing doesn't count. The speed is different from station to station. It depends on which station he goes to
When a train passes through a 320 meter tunnel, it takes 52 seconds to cross the 864 meter bridge, which is 1 / 4 higher than the tunnel time. It takes 1 minute 36 seconds to calculate the speed when crossing the bridge
1 minute 36 seconds = 96 seconds
v=s/t=864m/96s=9m/s=32.4km/h
It takes 52 seconds for a train to pass through a 320 meter long tunnel. When it passes through a 864 meter long bridge, the speed is 1 / 4 higher than that when it passes through the tunnel. As a result, it takes 1 minute 36 seconds. What is the length of the train body? The length of the train body? Is it the length of the whole train, or just the body?
It is assumed that the train is x meters long and the speed when passing through the tunnel is YM / s
fifty-two × Y=320+X
ninety-six × （1+1/4）Y=864+X
Y = 8m / S
X=96m
A: the train is 96 meters long
A train passes through a 320 meter long tunnel in 52 seconds. When it passes through a 864 meter long bridge, its speed is 1 / 4 higher than that when it passes through the tunnel It took 1 minute and 36 seconds to find the speed of the train passing the bridge and the length of the train body
Setting: the train body is x meters long
1 minute 36 seconds = 96 seconds
The speed through the tunnel is (320 + x) / 52
The speed through the bridge is (1 + 1 / 4) (320 + x) / 52
The speed through the bridge can also be calculated by distance and time, which is (864 + x) / 96
Then the following equation is listed:
（1+1/4）（320+X）/52=（864+X）/96
Solution: x = 96
That is, the train body is 96 meters long
Speed of train passing the bridge = (864 + 96) / 96 = 10 (M / s)
A: the speed of the train passing through the bridge is 10 m / s, and the length of the train body is 96 M
It takes 20 seconds for a train to travel at a constant speed through a 450m long tunnel. There is a lamp on the tunnel, and the light shines on the train for 5S. Why do you use the train length / time when the light shines on the top of the train?
When a train passes through a tunnel, it is necessary to consider entering the tunnel at the front and leaving the tunnel at the rear
Consider the length of the train and the length of the tunnel
The light shines on the train, but the length and speed of the train need to be considered
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