According to the graph, as the speed of the boat increases, the length of the bost also increases
According to the graph, the longer the sail boat the faster it can go
According to the graph, for a boat to reach the speed of 10 kilometers per hour, it needs to be atleast 16 feet long.
How I got the 16 feet, On your y - axis locate 10 km/hr and trace the graph to the x - axis.
According to the graph, The maximum speed that an 8 foot boat can reach is 7 kilometers per hour
A 16 foot boat as a maximum speed of 10 kilometers per hour
A 4 foot boat as a maximu speed of 5 kilometers per hour
The ratio of the two speed is 10 / 5
= 2
16 foot sail boat at top speed is 2 times as fast as a 4 - foot sailboat at top speed.