Question

15 POINTS!!!!! (SHOW ALL YOUR WORK)

Problem:
Antti entered a 10-kilometer race. His goal is to finish in one hour. He starts off sprinting, and completes the first 2 kilometers of the race at an average speed of 12 kilometers per hour.

To achieve his goal of a one-hour finish time, what average speed must Antti maintain for the last 8 kilometers of the race?

Enter your answer as a number in decimal form, without units.

Answer 1

Explanation:

time taken for 2 hrs.=2/12=1/6 hr

remaining time=1-1/6=5/6 hrs

average speed for 8 kilometers=8÷5/6=8×6/5=9.6 km/hrs