Question : A 750-metre-long train crosses a stationary pole in 15 sec. Travelling at the same speed, this train crosses a bridge completely in 25 sec. What is the length of this bridge?
Option 1: 1000 m
Option 2: 750 m
Option 3: 1250 m
Option 4: 500 m
Correct Answer: 500 m
Solution :
We know, $\text{Speed} = \frac{\text{Distance}}{\text{Time}}$
According to the question,
⇒ Speed of the train = $\frac{750}{15}$ = 50 m/s
⇒ Length of the bridge = 50 × 25 – 750 = 1250 – 750 = 500
Hence, the correct answer is 500 m.
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