Let length of bridge be x m.

We know, Speed = \( \Large \frac{Distance}{Time} \)

According to the question,

\( \Large 90 \times \frac{5}{18} = \frac{150+x}{26} \)

=> \( \Large 25 \times 26 \) = 150 + x

=> 650 = 150 + x

Therefore, x = 500 m