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A train travelling at a uniform speed passes by a platform 220 m long in 30 s and another platform 325 m long in 39 s. find  (i)  the length of the train and (ii) the speed of the train .

Asked by bishtbharat869 22nd August 2019, 5:14 PM
Answered by Expert
Answer:
Given s = t + 220/30 ... (i)
    and s =  t + 325/39 ... (ii)
Solving (i) and (ii), we get
39(t + 220) = 30(t + 325)
39t + 8580 = 30t + 9750
9t = 1170
t = 130 m
Put in (i), we get
Speed = 130 + 220/30
             = 350/30
             = 11.66 m/sec

S = 3600 × 11.66/1000
Answered by Expert 23rd August 2019, 10:04 AM
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