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Sagot :
Chile's speed is 60/4 * 1 = 15 mph
Chile's speed on her way back = 15/2 = 7.5 mph
Chile's average speed = (15+7.5) / 2 = 11.25 mph
Chile's speed on her way back = 15/2 = 7.5 mph
Chile's average speed = (15+7.5) / 2 = 11.25 mph
Answer:
Part A) Speed of Chloe's bicycle from her house to the library = 15 mph
part B) Average speed = 10 mph
Step-by-step explanation:
Chile rode her bicycle from her house directly to the library in 4 minutes. The library is 1 mile from her house.
Distance between house and library = 1 mile
Time taken from house to library = 4 minutes
As we know, 60 minutes = 1 hour
So, 4 minutes [tex]=\dfrac{1}{15}\ h[/tex]
[tex]\text{Speed} = \dfrac{\text{distance}}{\text{time}}[/tex]
[tex]\text{Speed}=\dfrac{1}{1/15}=15\text{ mph}[/tex]
Part A:
Speed of Chloe's bicycle from her house to the library = 15 mph
Part B: Chloe's trip back to her house took twice as long as her trip to the library.
- From house to library:-
Distance = 1 mile
Time [tex]=\dfrac{1}{15}\ h[/tex]
- From library to house
Distance = 1 mile
Time [tex]=\dfrac{2}{15}\ h[/tex]
[tex]\text{Average speed}=\dfrac{\text{Total distance}}{\text{Total time}}[/tex]
[tex]\text{Average speed}=\dfrac{1+1}{\frac{1}{15}+\frac{2}{15}}[/tex]
[tex]\text{Average speed}=\dfrac{2}{\frac{3}{15}}[/tex]
Average speed = 10 mph
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