A train passes an electrical pole in 20 seconds and passes a platform 250 m long in 45 seconds Find ...........

Quant (SSC) Problems on trains

A train passes an electrical pole in 20 seconds and passes a platform 250 m long in 45 seconds. Find the length of the train

300 m

200 m

400 m

250 m

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Explanation:

To solve this question we can apply a shot trick approach
Length of the train = Length of the platform /Difference in time x (Time taken to cross a man)
By the short trick approah, we get
Train length = 250 /45 - 20 x 20 = 200m
Traditional method:
Let the length of the train be x
∴ x/20 = x + 250 /45
⇒ 5x = 1000 ⇒ x = 200 m