Some question: In what time will a cart 50 m long cross, if its speed be 36 km/hr?
Options:
(A) 25
(B) 5
(C) 15
(D) 20
(E) 30
Some stream of consciousness:
Speed = 36 * 5/18 = 10 m/sec
Time taken = 50/10 = 5 sec. The answer: (B).