Correct Answer - Option 1 : 245 metre
Given:
Speed \(=\left(45 \times \dfrac{5}{18}\right)\) m/sec \(=\left(\dfrac{25}{2}\right)\) m/sec
Time = 30 sec.
Formula Used:
Distance = Speed × Time
Calculation:
Let the length of bridge be x metres.
\(\dfrac{10+x}{30}=\dfrac{25}{2}\)
⇒ 2(130 + x) = 750
⇒ x = 245 m.
Conclusion:
Length of bridge will be 245 metres
