Explanation:

- The total journey is 900 km, completed in 11 hours.

- Two-fifth of the journey is 360 km (i.e., \( \frac{2}{5} \times 900 \)).

- This 360 km is traveled at 60 km/h, taking 6 hours (\( \frac{360}{60} \)).

- The remaining journey is 540 km (\( 900 - 360 \)).

- This 540 km must be completed in 5 hours (\( 11 - 6 \)).

- To find the speed of the remaining journey: \( \frac{540}{5} = 108 \) km/h.

- Option 1: 108 km/h is the correct answer.

The correct answer is:

- Option 1: 108