17.How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 krn/hr in the direction of the moving train if the speed of the train is 63 km/hr ?
A. 25 B. 30
C. 40 D. 45
Answer:B
Speed of train relatively to man = ( 63 - 3)km/hr
= 60 km /hr
= (60 x 5 / 18)m/sec
= (50 /3) m/sec
Time taken to pass the man = (500 x 3 / 50)sec
= 30 sec.
