Answer:
It will take 2.5 hours.
Step-by-step explanation:
We know that,
\(Speed = \frac{Distance}{Time}\)
If distance is 80 miles and time taken is 2 hours,
Then,
\(Speed = \frac{80}{2}=40\text{ miles per hour }\)
Here sara is travelling with the constant speed which is 40 miles per hour,
If distance = 100 miles,
Hence, the time taken by her = \(\frac{Distance}{Speed}\)
\(=\frac{100}{40}=2.5\text{ hours}\)