A train running at the speed of 20 metres second crosses a pole in 24 seconds less than the time it ...........

Quantitative Aptitude ( CCS) Problems on trains

A train running at the speed of 20 metres/second crosses a pole in 24 seconds less than the time it requires to cross a platform thrice its length at the same speed. What is the length of the train ?

270 metres

340 metres

180 metres

160 meters

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Explanation:

Let the length of train be x meters.
Time taken in crossing the pole = x/20
Time taken in crossing the bridge = 4x/20
As given, 4x/20 – x/20 = 24
= 3x/20 = 24
= x = (24 × 20)/3
= 160 m