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

Answer:

11 km/h

Step-by-step explanation:

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

$\frac{20}{4}$ = 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×$\frac{1}{3}$ = 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