A train 50 m long passes a platform 100 m long in 10 seconds. The speed of the train in m/sec is ?
Choose the correct choice from the following answers:
A) 150	B) 50	C) 10	D) 15	E) 12

Rationale: speed of train = distance covered / time . = ( 50 + 100 ) / 10 = 15 m / sec . answer : d
Answer: D