Question

Justine swims butterfly at a pace of 50 laps per hour.Write an expression describing how many laps Justine can swim in h hours.Justine swam 225 laps so far this week. write and solve an equation to determine how many hours she has spent swimming.

Answer 1

4 hours and 30 min

1) Gathering the data:

Justine 50 laps/hour

2) We can write out the following equation from the Speed formula:

$\begin{gathered} V=\frac{l}{h} \\ 50=\frac{225}{h} \\ 50h=225 \\ \frac{50h}{50}=\frac{225}{50} \\ h=4.5 \end{gathered}$

3) Hence, Justine has spent 4 hours and 30 min swimming.