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lisabon 2012 [21]
2 years ago
12

GOD HALP MEEE: It takes Lucas 3 hours to cycle from his home to his friend's village. But if he travels 5 mph slower, it will ta

ke him 1.5 hours longer. How far is the friend's village from Lucas' house?
SAT
1 answer:
Bumek [7]2 years ago
8 0

Answer:

45 miles

Explanation:

Speed = distance / time

Lets assume :

speed = x

Distance = D

Time = 3 hours

so in first case :

x = D / 3

D = 3x

Second case :

speed = x-5  ( he is traveling 5mph slower )

Distance = D ( Distance is same )

time = 4.5 hour

so,

x-5 = D / 4.5

D = 4.5(x-5)

since D is same in both cases.

3x = 4.5(x-5)

3x = 4.5x - 22.5

4.5x - 3x = 22.5

1.5x = 22.5

x = 22.5/1.5

x= 15

so speed is 15mph

D= 3x

so Distance = 3*15 = 45 Miles.

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If we talk about translocation,it is  caused by rearrangement of parts between non homologous chromosomes. It can be balanced or unbalanced but it involves two genes or two sets of chromosomes. But in our example, we have only one sequence of DNA under study, therefore, inversion is not possible.

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Talking about insertion, it involves addition of one or more nucleotide at certain position of gene sequence. There are chances that it can be an insertion of GGG but the insertion of three G instead of any random nucleotide addition or nucleotide sequence addition is rare. So, there are less chances that this is an insertion and more chances that this is an exact duplication event.

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If we talk about duplication, a certain portion of a gene or chromosome is  replicated or duplicated in such a way that it results in more than one copies of that region.

Keeping that definition infront, we see that GGG duplicated to GGGGGG.  So, if we logically look at the question, duplication seems to be the most appropriate option.

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