How long does a train 100 m long running at the speed of 75 km/hr takes to cross a bridge 135 m length?
Select the correct option
A) 11.3 sec B) 12.1 sec C) 13.1 sec D) 16.5 sec E) 12.7 sec

Rationale: "speed = 75 * 5 / 18 = 20.8 m / sec total distance covered = 100 + 135 = 235 m . required time = 235 / 20.8 ' = 11.3 sec . answer : a"
Answer: A