# A train, 110 m long, is running at a speed of 60 km/hr. How many seconds does it take to cross another train, 170 m long, standing on parallel track ?

A train, 110 m long, is running at a speed of 60 km/hr. How many seconds does it take to cross another train, 170 m long, standing on parallel track ?

[A]15.6 sec

[B]16.8 sec

[C]17.2 sec

[D]18 sec

**16.8 sec**

$latex Speed\ of\ train = \frac{Sum\ of\ length\ of\ both\ trains}{Time\ Taken}&s=1$

$latex => \frac{60\times 5}{18} = \frac{110+170}{t} = \frac{280}{t}&s=1$

$latex => t = \frac{280\times 18}{60\times 5} = 16.8\ seconds&s=1$

Hence option [B] is correct answer.