a train length 100 m going with speed 10m/sec another train 150m long going with speed 15m/sec.the distance between two train is 50m.then how much time second train will take to cross the first train?	Options
A) 60 sec  B) 40 sec  C) 30 sec  D) 45 sec  E) 1 min 10 sec

Rationale: net speed = 15 - 10 = 5 m / sec net distance = 100 + 150 + 50 = 300 total time = 300 / 5 = 60 sec answer a
Answer: A