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Nikita ran a 5-kilometer race in 39 minutes (0.65 of an hour) without training beforehand. In the first part of the race, her average speed was 8.75 kilometers per hour. For the second part of the race, she started to get tired, so her average speed dropped to 6 kilometers per hour. Which expression represents Nikita’s distance for the second part of the race?

A. 6t
B. 0.65 – t
C. 6(0.65) – t
D. 6(0.65 – t)

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Аноним Аноним · Answer 1 · 2017-02-20T18:06:45+01:00

The correct answer for this is D 6(0.65-t) Hope this Helps :D

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lidaralbany lidaralbany · Answer 2 · 2019-07-04T10:42:42+02:00

Option: D is the correct answer.

The expression which represents Nikita’s distance for the second part of the race is:

D. 6(0.65 – t)

It given that:

Nikita ran a 5-kilometer race in 39 minutes (0.65 of an hour)

Also, In the first part of her race:

Her speed was 8.75 km per hour and time taken was t

In the second part of the race:

Her speed was 6 kilometer per hour.

So, the distance traveled by her in the second part is:

[tex]Distance=Speed\times Time[/tex]

Since we are given speed=6 kilometers per hour

and Time= 0.65-t

( Because she took a total of 0.65 hours and t hour was taken by her in first part)

So the time left is: 0.65-t

Hence, the distance for second part will be:

[tex]Distance=6(0.65-t)[/tex]