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

Answer: Option B

Given :
Speed of running train = 60 km/hr
Length of running train = 110 metres
⇒ Length of standing train = 170 metres
⇒ Speed of the standing train = 0 km/hr
⇒ Time taken by running train to cross the standing train :
$$\begin{array}{rl}& \Rightarrow \text{Time}=\frac{\left(100+170\right)\text{ metres}}{60\text{ km/hr}}\\ & \Rightarrow \text{Time }=\frac{280\times 18}{60\times 5}\\ & \Rightarrow \text{Time = 16}\text{.8 seconds}\end{array}$$