Question 9 of 10

Question

A rhino can run at speeds of about 28 miles per hour. What is that speed in feet per second, to the nearest whole number? (Remember, there are 5280 feet in a mile, 60 seconds in a minute, and 60 minutes in an hour.)
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• A. 88 feet per second
B. 41 feet per second
C. 36 feet per second
D. 189 feet per second

Answer 1

To convert the speed of the rhino from miles per hour to feet per second, we can use the following conversions:

1 mile = 5280 feet
1 hour = 3600 seconds

First, we can set up the conversion from miles per hour to feet per second:

\[ \text{Speed in feet per second} = \text{Speed in miles per hour} \times \left( \frac{5280 \text{ feet}}{1 \text{ mile}} \right) \times \left( \frac{1 \text{ hour}}{3600 \text{ seconds}} \right) \]

Now, substituting the speed of the rhino (28 miles per hour):

\[ \text{Speed in feet per second} = 28 , \text{miles per hour} \times \frac{5280 , \text{feet}}{1 , \text{mile}} \times \frac{1 , \text{hour}}{3600 , \text{seconds}} \]

Calculating this step by step:

1. Multiplying miles by feet: \[ 28 \times 5280 = 147840 , \text{feet per hour} \]

2. Now, converting feet per hour to feet per second: \[ \frac{147840 , \text{feet}}{3600 , \text{seconds}} \approx 41.2 , \text{feet per second} \]

Rounding this to the nearest whole number gives us approximately 41 feet per second.

Thus, the answer is:

B. 41 feet per second