A train 280 m long, running with a speed of 72 km / hr will pass a tree in
Choices: A) 14 sec B) 15 sec C) 16 sec D) 20 sec E) none

Rationale: "sol . speed = ( 72 x 5 / 18 ) m / sec . = 20 m / sec . time taken = ( 280 x 1 / 20 ) sec = 14 sec answer a"
Answer: A