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vesna_86 [32]
3 years ago
13

Car A went 60 km in 5 6 hour while a car B went 54 km in 2 3 hour. Which car was faster? How many times faster?

Mathematics
1 answer:
Alexxx [7]3 years ago
4 0

Answer:car B is faster

Step-by-step explanation:

Car A:

Speed=distance ➗ time

Speed=60 ➗ 5/6

Speed=60 x 6/5

Speed=(60x6)/5

Speed=360/5

Speed of car A=72 km/hr

Car B:

Speed=distance ➗ time

Speed=54 ➗ 2/3

Speed=54 ➗ 2/3

Speed=54 x 3/2

Speed=(54x3)/2

Speed=162/2

Speed of car B=81 km/hr

Therefore car B is faster

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3 years ago
What is the sum of the sequence 152,138,124, ... if there are 24 terms?
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Answer: -216

Step-by-step explanation:

To solve the exercise you must use the formula shown below:

Sn=\frac{(a_1+a_n)n}{2}

Where:

a_1=152\\a_n=a_{24}

You should find  a_{24}

The formula to find it is:

a_n=a_1+(n-1)d

Where d is the difference between two consecutive terms.

d=138-152=-14

Then:

a_{24}=152+(24-1)(14)=-170

Substitute it into the first formula. Therefore, you obtain:

S_{24}=\frac{(152-170)(24)}{2}=-216

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