Sudhin cycled at 8 5 km h for 4 hours then took an auto and travelled at 20 km h for 1 5 hours and t...........

Quantitative Aptitude (CGL) Time and work

Sudhin cycled at 8.5 km/h for 4 hours, then took an auto and travelled at 20 km/h for 1.5 hours, and then walked at 4 km/h for y hours. If Sudhin's overall average speed for the entire journey was 10 km/h, what is the value of y?

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