Sarah burns an average of 744 calories in 45 minutes while running. She ran at 10 miles per hour. There are 5,280 feet per a mile. How many calories did Sarah burn per foot? Round to the nearest tenthousandth.

Answers

Answer 1
Answer: Number of miles ran by Sarah in 1 hour or 60 minutes = 10 miles
Then
The number of miles ran by Sarah in 45 minutes = (10/60) * 45 miles
                                                                               = (45/6) miles
                                                                               = 15/2 miles
                                                                               = 7.5 miles
Now we already get from the question certain important data. From those data we come to know
1 mile = 5280 feet
So
7.5 miles = (5280 * 7.5) feet
                = 39600 feet
By running 39600 feet the amount of calories burnt by Sarah = 744 calories
So
By running 1 foot, the amount of calories burnt by Sarah = (744/39600) calories
                                                                                           = 0.019 calories
                                                                                           = 0.02 calories
So Sarah burns 0.02 calories per feet.
Answer 2
Answer: (744 calories/ 45 minutes)* (60 minutes/ 1 hour)* (1 hour/ 10 miles)* (1 mile/ 5,280 ft)= 0.018788 calories/ft.
(Note that the units cancel out so you get the answer)

Rounded to the nearest ten thousandth, the final answer is 0.0188 calories/ft~

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Multiples of -140:
1 and -140 is wrong because 1 + -140 = -139
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2 and -70 is wrong because 2 + -70 = -68
-2 and 70 is wrong because -2 + 70 = 68
4 and -35 is right because 4 + -35 = -31
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