Question

A bird flies at a speed of 15 miles per hour. The bird has already flown 28 miles. After how many additional hours will the bird have flown more than 80 miles?
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5
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3
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6
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4

Answer 1

To find out how many additional hours the bird needs to fly to exceed 80 miles, we will first determine how many more miles it needs to fly beyond the 28 miles it has already flown.

1. Calculate the distance the bird still needs to fly:
\[
80 \text{ miles} - 28 \text{ miles} = 52 \text{ miles}
\]

2. Next, we need to figure out how many hours it will take to fly these additional 52 miles at a speed of 15 miles per hour:
\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{52 \text{ miles}}{15 \text{ miles per hour}} \approx 3.47 \text{ hours}
\]

Since we want to know **after how many additional hours the bird will have flown more than 80 miles**, we can round up the 3.47 hours to the nearest whole number, which is 4 hours.

Thus, the answer is **4 hours**.