750 metres 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?
Answer & explanation
Correct answer: option 4
Train crosses a pole in 15 sec .
Speed of train = \(\frac{Distance }{time}\)
= \(\frac{750}{15}\) = 50 m/sec
Time to cross bridge = 25 sec
Total distance = Length of train + Length of bridge
Total distance = 50 × 25 = 1250 m
1250 = 750 + length of bridge
Length of bridge = 1270 - 750 = 500 m