All Question-Answers Revision - **Question-Bank**

correct answer : 350 meters

Explanation:- Let length of the platform be x metre ( x + 300 ) : 300 = 39 : 18

⇒ ( x + 300 ) : 300 = 13 : 6

⇒ 6x + 1800 = 3900

⇒ x = 350

correct answer : 182 km/hr

Explanation:- Length of the train = 150 m

Speed of the man = 2 km/hr

Relative speed = 150/3 = 50 m/s = 50 × 18/5 = 180 km/hr

Relative speed = Speed of train - Speed of the man (as both are moving in the same direction).

Therefore, Speed of the train = Relative speed + Speed of the man = 180 + 2 = 182 km/hr

correct answer : 4 percent