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It takes 25 seconds for a train to pass through a 250 meter long tunnel and 23 seconds to pass through a 210 meter long tunnel. If the train meets another 150 meter long train with a speed of 72 km / h, it will be necessary for the train to miss______ second?
The speed of this train is: (250-210) / (25-23) = 40 △ 2 = 20 (M / s); 72km / h = 20 m / s. The time required for passing by a wrong train is: [(20 × 25-250) + 150] / (20 + 20) = [(500-250) + 150] / - 40, = [250 + 150] / - 40, = 400 / - 40, = 10 (s)
It took 23 seconds for a train to pass through a 342 meter tunnel, and then 17 seconds for it to pass through a 234 meter tunnel. The train missed another 88 meter long train with a speed of 22 meters per second, and asked if it was necessary______ Seconds
The speed of the train is: (342-234) / (23-17) = 108 △ 6, = 18 (M / s); the length of the train is: 23 × 18-342 = 414-342, = 72 (m); the passing time of the two trains is: (72 + 88) / (18 + 22) = 160 △ 40, = 4 (s), a: it takes 4 seconds; so the answer is: 4
Nanjing Yangtze River Bridge is about 6800m long, and Wuhan Yangtze River Bridge is one fourth of its length. How many meters shorter is Wuhan Yangtze River Bridge than Nanjing Yangtze River Bridge
6800-6800*1/4=5100
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