• # question_answer A train 300 m long is running at a speed of 90 km/hr. How many seconds will it take to cross a 200 m long train running in the opposite direction at a speed of 60 km/hr? A)  9 sec                B)  15 sec C)  18 sec  D)  12 sec

[d] $t=\frac{300+200}{\left( 90+60 \right)\times \frac{5}{18}}$ $=\frac{500\times 18}{150\times 5}=12\,\sec$