Question

Jon walked 80 feet in 14.3 seconds what is his speed in miles per hour?

Answer 1

5.59440559 ft/s = 3.814367 mph

⚠ If you are in a rush, only read the bold.

Formula: MPH (?) = FT/SEC (5.59440559) × 0.681818

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Answer 2

Conversion

Since the information is given in feet and seconds, and we want the answer in miles and hours, we make a conversion:

Miles

We want to find how many miles correspond to 80 feet if 1 mile is 5280 feet. We have the following equivalence

? miles ↔ 80 feet

1 miles ↔ 5280 feet

If we divide both side of the equivalence we will have the same result:

`\begin{gathered} (?)/(1)=(80)/(5280) \\ \downarrow \\ ?=(8)/(528) \\ \text{?=}(1)/(66)\cong0.015 \end{gathered}`

Then, 80 feet are 0.015 miles

Hours

We want to find how many hours correspond to 14.3 second if 1 hour is 3600 seconds. We have the following equivalence

? hours ↔ 14.3 seconds

1 hours ↔ 3600 seconds

If we divide both side of the equivalence we will have the same result:

`\begin{gathered} (?)/(1)=(14.3)/(3600) \\ \downarrow \\ ?=0.00397\cong0.004 \end{gathered}`

Then, 14.3 seconds are 0.004 hours

Speed

We find the speed by dividing both values:

speed = miles / hour

then,

`(0.015)/(0.004)=3.7878\cong3.8`

Answer- the speed is 3.8 miles per hour