एक रेलगाड़ी की टेलीग्राफ पोस्ट को 40 सेकंड में 36 किलोमीटर घंटा की चाल से प्रकृति रेलवे की लंबाई है
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time 40 second and speed= 10 meter/second,, we know that distance = speed × time so 40×10= 400 meters
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speed of train = length of train / Time taken to cover telegraph
36×5/18 = L/40
10×40= L
L = 400 meters
36×5/18 = L/40
10×40= L
L = 400 meters
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