Question

If a $200$ m long train crosses a platform of the same length as that of the train in $20$ seconds, then the speed of the train is

• A. $50\text{km/hr}$
• B. $60\text{km/hr}$
• C. $72\text{km/hr}$
• D. $80\text{km/hr}$

Answer 1

The correct option is C $72\text{km/hr}$

$\begin{array}{c}speedoftrain=lengthoftrain+\frac{lengthofplatform}{time}\\ =\frac{\left(250+250\right)}{25}=20m/s\\ =72km/h\end{array}$