On a particular day, caroline decided to run two laps of a park of which each lap is 1. 2kms. She takes 12 minutes to run her fi

Question

3 years ago

7

rst lap, and she runs her second lap at an average speed of 7 km/h. Determine her average speed over the two laps.

1 answer:

san4es73 [151] · Answer 1 · 2022-10-26T21:03:19+03:00

7 0

Answer:

6.46 km/h

Explanation:

Total distance d = 2 * 1.2 = 2.4 km

Total time t = 12 min + t' where t' is the time taken for second lap.

t' = 1.2 km/(7 km/h) = 1.2/7 hours

so t = 12/60 hours + 1.2/7 hours = 0.3714 hours

The average speed = d/t - 2.4/0.3714 = 6.46 km/h