Question

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?

6t
0.65 – t
6(0.65) – t
6(0.65 – t)

Answer 1

The answer is 6(0.65-t)

Answer 2

   Expression for the distance covered by Nikita in the second part will be 6(0.65 - t).

  Given in the question,

• Nikita ran total distance = 6 km
• Time taken by Nikita to complete the race = 39 minutes Or 0.65 hours
• First part covered with the average speed = 8.75 km per hour
• Second part was covered with the average speed = 6 km per hour

Let the time taken by Nikita in first part of the race = t hours

So the time taken in second part = (0.65 - t) hours

Since, Distance = Speed × Time

Therefore, distance covered in second part of the race = 6(0.65 - t) hours

      Hence, second part of the race will be covered in 6(0.65 - t) hours

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