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strojnjashka [21]
4 years ago
5

A tourist first walked 17 km with a speed of v km/h. Then he hiked 12km with a speed that was 2km/hour less than his original sp

eed. The whole trip took him t hours.
a) Write a formula for t in terms of v.

b) How much time did the tourist take spend on this trip if his original speed was 5km/h?
Mathematics
1 answer:
katrin2010 [14]4 years ago
8 0
The time it takes for an object/person to cover a certain distance is calculated by dividing the distance by the speed.

a. For the first question, the equation would become,

     t = 17/v + 12/(v - 2)

b. To answer, this we simply have to substitute 5 to the v of the first equation,

    t = 17/5 + 12/(5 - 2)

    t = 7.4 hours

<em>Answer: 7.4 hours</em>
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Answer:

She ran

6 \frac{3}{10} km \: or \: 6.3 \: km

Step-by-step explanation:

To find the answer you multiply the amount of races (9) by the length of each race (7/10 km).

\frac{7}{10}  \times  \frac{9}{1}  =  \frac{63}{10}  \: or \: 6 \frac{3}{10}

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To select any 5 numbers out of 40

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