The bridge is 130 metres long and can be crossed in 30 seconds by a train travelling at 45 kilometres per hour.
A. 200 m
B. 225 m
C. 245 m
D. 250 m
Answer:C
The bridge is 130 metres long and can be crossed in 30 seconds by a train travelling at 45 kilometres per hour.
A. 200 m B. 225 m C. 245 m D. 250 m
Explanation: 45 x 5/18 m/sec = 25/2 m/sec. Allow 30 seconds and a bridge length of x metres. As a result, 130 + x/30 = 25/2= 2(130 + x) = 750 , x = 245 m.