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A train is 200m long and it takes 2min to pass through a 1000m long tunnel. How long does it take to pass through a 3.4km long bridge at this speed
The train speed is (200 + 1000) ÷ 120 = 10m / s
It takes (3400 + 200) / 10 = 360 seconds = 6 minutes to cross the 3400 meter bridge
A train is 200m long and passes through a bridge completely at the speed of 54km / h. It takes 2min. How long is the bridge?
s1=vt=15m/s × 120s=1800m
s=s1-s2=1800m-200m=1600m
The distance of the train is the length of the bridge and the length of the train, i.e. s = s Bridge + s fire
A train passes through a tunnel with a length of 1000m in 80s at the speed of 54km / h. calculate the train length A train passes through a tunnel with a length of 1000m in 80s at the speed of 54km / h. calculate the train length
two hundred
It takes 80s for a 200m train to pass through the tunnel, and the known speed is 50M / s. calculate the length of the tunnel
80 * 50-200 = 3800m. This 80s includes the length of the train itself
A 140m long train passes through a straight tunnel at the speed of 72km / h. It is known that the time of the whole train body in the tunnel is 42s. Find: 1. What is the length of the tunnel? 2. How long does it take from the front of the train into the tunnel to the rear of the train out of the tunnel? Explain the reason and explain the key reason
First, the unit conversion is 72km / h = 20m / s. The time of the whole train body in the tunnel is 42s. Tunnel length = time of the whole train in the tunnel * running speed + train length. Tunnel length = 42s * 20m / S + 140m = 980m. How long does it take from the front of the train into the tunnel to the rear of the train out of the tunnel? Total time = tunnel length + train
The speed of the car is 37.5% slower than that of the train, and the speed of the train is several percent faster than that of the car
（1-37.5%）：1=62.5:100
100÷62.5=400÷250=8/5=1.6
1.6-1=0.6=60%
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