Question

Find the length of a bridge on which a 120 m long train, travelling at 54 kmph, completely passes in 30 seconds.​

Answer 1

The length of bridge is 330 m

Step-by-step explanation:

Let the length of bridge be x

Total distance cover by train to cross the bridge, d = (x+120) m

Speed of train, s = 54 km/h

Time to passes the bridge, t = 30 seconds

$distance=speed\times time$

$x+120=\dfrac{1000}{3600}\times 54\times 30$          $\because 1\ km/h=\dfrac{5}{18}\ m/s$

$x+120=450$

$x=450-120$

$x=330$

The length of bridge is 330 m

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Answer 2

Answer:

✰given :

Find the length of a bridge on which a 120 m long train, travelling at 54 kmph, completely passes in 30 seconds.

✰solution:

Speed of the train = 54 kmph =54×$\frac{5}{18} = 15 \: m / s$

Distance covered in 30 s = 15×30=450 m

ஃ length of the bridge = Distance covered — Length of the train = 450 –120=330 m.