A speed of 10 m/s means that it takes 1 second for the ball to travel 10 meters. To find how long will it take to travel 40 meters, we can use the next proportion:
[tex]\frac{10\text{ meters}}{40\text{ meters}}=\frac{1\text{ second}}{x\text{ seconds}}[/tex]Solving for x:
[tex]\begin{gathered} 10\cdot x=1\cdot40 \\ x=\frac{40}{10} \\ x=4\text{ seconds} \end{gathered}[/tex]It will take 4 seconds to travel 40 meters
