Difference between revisions of "2014 AMC 10B Problems/Problem 8"
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− | ==Problem | + | ==Problem== |
A truck travels <math>\dfrac{b}{6}</math> feet every <math>t</math> seconds. There are <math>3</math> feet in a yard. How many yards does the truck travel in <math>3</math> minutes? | A truck travels <math>\dfrac{b}{6}</math> feet every <math>t</math> seconds. There are <math>3</math> feet in a yard. How many yards does the truck travel in <math>3</math> minutes? | ||
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==Solution== | ==Solution== | ||
+ | |||
+ | Converting feet to yards and minutes to second, we see that the truck travels <math>\dfrac{b}{18}</math> yards every <math>t</math> seconds for <math>180</math> seconds. We see that he does <math>\dfrac{180}{t}</math> cycles of <math>\dfrac{b}{18}</math> yards. Multiplying, we get <math>\dfrac{180b}{18t}</math>, or <math>\dfrac{10b}{t}</math>, or <math>\boxed{\textbf{(E)}}</math>. | ||
+ | |||
+ | ==Solution 2== | ||
+ | |||
+ | We set a proportion by letting the <math>x</math> being the number of feet the truck travels in <math>3</math> minutes. | ||
+ | |||
+ | <math>\frac{\frac{b}{6}}{t}=\frac{x}{180}</math> | ||
+ | |||
+ | <math>\frac{b}{6t}=\frac{x}{180}</math> | ||
+ | |||
+ | <math>\frac{180b}{6t}=x</math> | ||
+ | |||
+ | <math>x=\frac{30b}{t}</math> | ||
+ | |||
+ | Remember <math>x</math> is the number of feet the truck travels, so we divide by <math>3</math> to convert to yards. | ||
+ | |||
+ | <math>\frac{x}{3}=\frac{10b}{t}</math>, which corresponds to <math>\boxed{\text{(E)}}</math> | ||
+ | |||
+ | ==Video Solution== | ||
+ | https://youtu.be/j5pWLnlQkwE | ||
+ | |||
+ | ~savannahsolver | ||
==See Also== | ==See Also== | ||
{{AMC10 box|year=2014|ab=B|num-b=7|num-a=9}} | {{AMC10 box|year=2014|ab=B|num-b=7|num-a=9}} | ||
{{MAA Notice}} | {{MAA Notice}} |
Latest revision as of 11:25, 16 July 2020
Problem
A truck travels feet every seconds. There are feet in a yard. How many yards does the truck travel in minutes?
Solution
Converting feet to yards and minutes to second, we see that the truck travels yards every seconds for seconds. We see that he does cycles of yards. Multiplying, we get , or , or .
Solution 2
We set a proportion by letting the being the number of feet the truck travels in minutes.
Remember is the number of feet the truck travels, so we divide by to convert to yards.
, which corresponds to
Video Solution
~savannahsolver
See Also
2014 AMC 10B (Problems • Answer Key • Resources) | ||
Preceded by Problem 7 |
Followed by Problem 9 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AMC 10 Problems and Solutions |
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