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AlladinOne [14]
3 years ago
9

Katalin drove 180 miles on her vacation. She drove an average of 1.5 times faster on the second 90 miles of her trip than she di

d on the first 90 miles of her trip. Which expression represents the time she spent driving? Let x = her speed on the first half of the trip.
A. 150/x
B. 300/x
C. 150x
D. 225/x
Mathematics
2 answers:
Kisachek [45]3 years ago
8 0

Answer: 150/x

Step-by-step explanation: JeanaShupp is correct. Just took the quiz.

SpyIntel [72]3 years ago
3 0

Answer: A) \frac{150}{x}

Step-by-step explanation:

We know that \text{Time}=\frac{\text{Distance}}{\text{Speed}}

Let x be her speed on the first half of the trip.

Then for first half , the time taken by her is given by :_

t_1=\frac{90}{x}

For second half , the time taken by her is given by :_

t_2=\frac{90}{1.5x}\\\\\Rightarrow\ t_2=\frac{60}{x}

Now, the total time taken by her is given by :_

t=t_1+t_2\\\\\Rightarrow t=\frac{90}{x}+\frac{60}{x}\\\\\Rightarrow t=\frac{90+60}{x}\\\\\Rightarrow t=\frac{150}{x}

Hence, the expression represents the time she spent driving is \frac{150}{x}

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