Question

.a train ,130 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. the length of the bridge is

Answer 1

speed = 45kmph = 12.5 m/s

Distance travelled in 30 sec = 12.5 m/s × 30s = 375m

length of bridge = 375 - 130 = 245m

Answer 2

Answer:

245 m

Step-by-step explanation:

Speed of train = 45 km/hr = $45 \times \frac{5}{18}= 12.5 m/s$

Let the length of bridge be x

Length of train = 130 m

Total distance traveled = 130+x

Total time = 30 seconds

$Speed = \frac{Distance}{Time}$

$12.5= \frac{130+x}{30}$

$12.5 \times 30= 130+x$

$375= 130+x$

$375-130=x$

$245=x$

Hence the length of the bridge is 245 m