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Oduvanchick [21]

3 years ago

12

Sandra walked to the top of a hill at a speed of 2 km/h, turn around and walked down the hill at a rate of 4 km/h. the whole tri

p took 6 hours. how many kilometres is it to the top of the hill?

1 answer:

hichkok12 [17]3 years ago

5 0

D is distance.
<span>d/2 + d/4 = 6 </span>
<span>3d/4 = 6 </span>
<span>d = 8 km </span>

<span>Check: at 2 k/h, 4 hours; </span>
<span>at 4 k/h, 2 hours; </span>
<span>total, 6 hours. hope i helped</span>

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dalvyx [7]

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3 years ago

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nikdorinn [45]

Answer:

$8 \frac{1}{4}$

Step-by-step explanation:

Let us solve

$2 \frac{5}{8} \times 3 \frac{1}{7} \\ \frac{21}{8} \times \frac{22}{7} \\ \frac{462}{56} \\ \frac{462 \div 2}{56 \div 2} \\ \frac{231}{28} \\ \frac{231 \div 7}{28 \div 7} \\ \frac{33}{4} \\ 8 \frac{1}{4}$

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em><em>you</em><em>.</em>

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5 0

2 years ago

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MrMuchimi

Answer:

standard error of the mean = 1.6960

Step-by-step explanation:

Given -

Mean $(\overline{X})$ = 53 minutes

Standard deviation ( s ) = 53.9 minutes

n = 1010

standard error of the mean =

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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2 years ago

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