The length of the bridge, which a train 500 metres long and travelling at 42 km/hr can cross in 60 seconds, is?  Pick one: A) 100 m B) 200 m C) 300 m D) 250 m E) 350 m

Rationale: "speed = [ 42 x 5 / 18 ] m / sec = [ 35 / 3 ] m / sec time = 30 sec let the length of bridge be x metres . then , ( 130 + x ) / 60 35 / 3 = ( 130 + x ) / 60 500 + x = 700 = > x = 200 m answer : b"
Answer: B