Question

PLEASE HELP SOON! Please answer the question and explain step by step how you got your answer. Julian is using a biking app that compares his position to a simulated biker traveling Julian's target speed. When Julian is behind the simulated biker, he has a negative position. Julian sets the simulated biker to a speed of 20 km/h. After he rides his bike for 15 minutes, Julian's app reports a position of -2 1/4 km.

What has Julian's average speed been so far?

Answer 1

11 km/h

Explanation:

What I did is found out how fast the simulated biker traveled for 15 minutes, by doing

`(20)/(4)` = 5

Since 15 minutes is 1/4 of an hour. Or you could do 20/60 = 1/3, 1/3 being how much the biker traveled in a minute and multiply that by 15

15×
`(1)/(3)` = 5

Now we know that the biker traveled 5 km, now subtract 5 by
`2 \frac {1}{4}`

5 -
`2 \frac {1}{4}` =
`2 \frac {3}{4}`

Julian traveled 
`2 \frac {3}{4}` in 15 minutes, now to find his average speed you multiply
`2 \frac {3}{4}` by 4 since
`2 \frac {3}{4}` is the distance traveled in 1/4 an hour.

`2 \frac {3}{4}` × 4 = 11

11 km/h