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 Aug, 2019, 05:14: PM

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 Sneha shidid | 23rd Aug, 2019, 10:04: AM