A goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 26 seconds. What is the length of the goods train?

Speed = $$\left ( 72 \times \frac{5}{18} \right )$$ m/sec= 20 m/sec.
Then, $$\left [ \frac{x + 250}{26} \right ] = 20$$