A distance of 68 km is represented on a map by 1.7 cm. What distance is represented by 8.5 cm on the same map?

A bus is running at a uniform speed. It covers a distance of 435 km in 6 hours. How much distance will it cover in 8 hours ?

The ratio between 6 cm and 20 mm is

1. 3 : 1
2. 3 : 10
3. 6 : 10
4. 3 : 2