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  1. Two trains are running 40 km/hr and 20 km/hr respectively in the same direction. The fast train completely passes a man sitting in the slow train in 5 seconds. The length of the fast train is
    1. 23
      2
      m
      9
    2. 27 m
    3. 27
      7
      m
      9
    4. 23 m
Correct Option: C

Relative speed = 40 – 20 = 20 km/hour

=
20 × 5
m/sec.
18

∴   Length of the faster train =
20 × 5
× 5 metres
18

=
250
= 27
7
metres
99



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