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GenaCL600 [577]
3 years ago
11

Vincent sets off from his home on a 70 km journey to his friend's house. He travels the first 40 km of his journey at an average

speed of 40 km/h and the remaining at an average speed of 60 km/h. Calculate the average speed for his entire journey.
Mathematics
2 answers:
bonufazy [111]3 years ago
7 0

Answer:

46\frac{2}{3}\:\mathrm{km/h}

Step-by-step explanation:

Average speed can be given by:

S=\frac{d}{t}, where d is the total distance travelled and t is the time it takes to travel said distance.

Vincent total travels 70 kilometers in a total time of:

\frac{40}{40}+\frac{30}{60}=1.5\:\mathrm{hours}.

Therefore, his average speed during the entire trip is:

S=\frac{70}{1.5}=\fbox{$46\frac{2}{3}\:\mathrm{km/h}$}.

Ilia_Sergeevich [38]3 years ago
3 0

Answer:

50km/h.

Step-by-step explanation:

70  km \:  {5}^{2}

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If Jake drove 3/4 of the 128-mile trip, how many miles did he drive?
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4 0
3 years ago
In 1990, Dawn gross pay was $48,000.
forsale [732]

A. Dawn's gross monthly pay is<em> $4,000</em> ($48,000/12).

B. The month that Dawn hit her maximum taxable Social Security Income is May (5 months from January to May).

C. In February, 1978, Dawn paid <em>$260</em> in Social Security Tax.

D. In May, 1978, Dawn paid <em>$110.50</em> in Social Security Tax, which represented the balance.

E. In November, 1978, Dawn paid <em>$0</em> in Social Security Tax because by May she had completely paid the maximum Social Security Tax of $1,150.50.

<h3>Data and Calculations:</h3>

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Monthly Social Security Tax = $260 ($4,000 x 6.5%)

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In 5 months, Dawn would have paid a <em>total of $1,150.50</em> ($260 x 4 + $110.50) in Social Security Tax.

Thus, the total Social Security Tax paid by Dawn in that year was <em>$1,150.50.</em>

Learn more about Social Security Tax here: brainly.com/question/9741758

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