Question

A train travelling at a uniform speed passes by a platform 220 m long in 30 sec and another platform 325 m long in 39 sec. Find the length of the train​

Answer 1

Answer:

42.

Step-by-step explanation:

Given s = t + 220/30 ------ (1)

   and s =  t + 325/39 ------ (2)

on solving (1) and (2), we get

39(t + 220) = 30(t + 325)

39t + 8580 = 30t + 9750

9t = 1170

t = 130 metres

Substitute in (1), we get

Speed = 130 + 220/30

            = 350/30

            = 11.66 m/sec

On converting it to km/hr, we get

S = 3600 * 11.66/1000

          = 41.9

          = ~42

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Answer 2

Answer:

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Step-by-step explanation:

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