Question

A train-K whose length is 200 m, passes a train-B (which is not moving) of 400 m long in 15 s. Find the speed of the train-K.

• A. 20 m/s
• B. 50 m/s
• C. 100 m/s
• D. 40 m/s

Answer 1

Answer: (D)

40 m/s

Distance travelled = Length of train-K + length of train-B

= 200 m + 400 m

= 600 m

Time taken to cross train-B = 15 s

$\because$ $speed=\frac{distance}{Time}$

$\Rightarrow$ Speed of train-K = $\frac{600}{15}$

= 40 m/s