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1. A train moseconds respectively, win moves past a telegraph post and a bridge 264 m long in 8 seconds and 20spectively. What is the speed of the train ?69.5 km/hr (b) 70 km/hr(8.8.c. 2004) |
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Answer» Trains speed is 70 km /hr Length of the Bridge = 264 m.Time taken to pass the bridge = 20 sec. Time taken to passe the post = 8 sec.Length of the train = X m (Let.)To pass the bridge train need to coverTrain's length + Bridge legnth(X +264).Speed = Distance covered / time takenNow,X/8 = (264 + X)/2020X = 264 *8 + 8X 20X - X = 264 *8 12X = 264 *8X = (264 *8)/12X = 176 m.Speed of the train = 176/8 = 22 m/sec = (22*18)/5 = 79.2 Kmph. |
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