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標題:

一列長為500米的火車，以時速60公里穿過一條長達1000米

發問:

一列長為500米的火車，以時速60公里穿過一條長達1000米的隧道，火車過隧道要多少時間呢？

最佳解答:

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• 我入唔到GrundChase(三小俠)(香港)

 

此文章來自奇摩知識+如有不便請留言告知

AB is the length of the tunnel A B C =============== e******f e******f length of AC = length of tunnel +length of the train length = 1000 m + 500 m = 1500 m = 1.5 km (1 km = 1000 m) speed of the train = 60 km/h time required = distance / speed = 1.5 km / 60 km/h =0.025 h 0.025 h = 0.025 x 60 min. = 1.5 min. = 1.0 min + 0.5 min = 1 min. 30 s (Note : half of a min. = 30 s) Time required for the point f to move from A to C is 1 min. 30 sec. Note: x represents multiply f is the front part of the train e is the end part of the train Drawing is not to scale.

其他解答:

1000米=1km The speed of the train:60km/h ________________ 1500m/60(km/h) 1.5/60 =1/40 hour(which means 1.5minutes) ______________|||||你點得出這個答案！？|||||30min ok?- -