In a race of 400 metres, A will beat C by

In a race of 1000 metres, A can beat B by 50 metres and in a race of 500 metres, B can beat C by 10 metres. In a race of 400 metres, A will beat C by

1. 28.6 metres
2. 30 metres
3. 23.8 metres
4. 27.6 metres