Question

A 60 m long train moving on a straight level track passes a pole
in 5 s. Find the speed of the train and the time it will take to
cross a 540 m long bridge.​

Answer 1

speed =distance/time

x=540m/5s

the second unit is small so we convert it into minutes

1min=60s

1s=1/60 min

so,5s=5/60=1/12

speed = 540m×1/12min=45m/min

formula to calculate time=distance/speed

=540/45= 12min

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Answer 2

Answer:

12m/s & 50s

Explanation:

Given:

Length of train = 60m

Time is taken to cross the pole = 5s

Length of bridge = 540m

Speed of train = $\bf \dfrac{length \ of \ train}{Time \ taken \ to \ cross \ pole}$

Speed of train = $\sf \dfrac{60}{5}$

Speed of train = 12m/s

Now, distance to be covered to cross a 540m long bridge = length of the train + Length of bridge

Distance to be covered = 60 + 540 = 600m

Hence, time taken :

$\sf \dfrac{Distance}{Speed}$

→ 600/12 = 50s