Answer:
Tabita's average speed was [tex]21.6\,\,\frac{km}{h}[/tex]
Step-by-step explanation:
Let's start by finding the distance Badr covered during the 1.5 hour trip at the speed of 18 km/h. We use the velocity formula for that:
[tex]vel=\frac{distance}{time} \\18=\frac{distance}{1.5} \\distance=18\,*\,1.5 \,\,km\\distance= 27\,\,km[/tex]
Using the same basic formula, we can now estimate Tabita's average speed knowing that it took her 1 hour and 15 minutes (1.25 hours) to complete the trip:
[tex]vel=\frac{distance}{time} \\vel=\frac{27\,\,km}{1.25\,h}\\vel=21.6\,\,\frac{km}{h}[/tex]
