In the same direction, two trains are travelling at 40 km/hr and 20 km/hr, respectively. In less than 5 seconds, a fast train passes a man on a slower train. What is the fast train's duration?
A. 23 m
B. 23 2/9 m
C. 27 7/9 m
D. 29 m
Answer:C
In the same direction, two trains are travelling at 40 km/hr and 20 km/hr, respectively. In less than 5 seconds, a fast train passes a man on a slower train. What is the fast train's duration?
A. 23 m B. 23 2/9 m C. 27 7/9 m D. 29 m
Explanation: 40 - 20) km/hr = ( 20 x 5/18 ) m/sec = ( 50/9) m/sec As a result, the length of the speedier train is ( 50 x 5/9) m = 250/9 m = 27x7/9 m.