Question

a remote-control travels at the rate of 10 ft per second how many inches per second is this

Answer 1

1 foot is equivalent to 12 inches

Then, to find how many inches are 10 ft, we can use the next proportion:

$\frac{1\text{ ft}}{10\text{ ft}}=\frac{12\text{ in}}{x\text{ in}}$

Solving for x:

$\begin{gathered} 1\cdot x=12\cdot10 \\ x\text{ = 120 in} \end{gathered}$

Then, the rate is 120 inches per second