Some friends went hiking for 3.5 hours. They traveled 21 kilometers in that time. Birgit was 4 minutes/km faster than the average time. If Birgit kept the same pace, how many minutes would it take her to go 8 kilometers?
Please answer the following question by reasoning step-by-step.
48
Minutes spent hiking = 3.

5 * 60 = 210 minutes.

Average speed = 210 minutes / 21 km = 10 minutes / km.

Birgit is 4 minutes / km faster = 10 - 4 = 6 min / km.

It would take 6 * 8 = 48 minutes to go 8 km.

Birgit would take 48 minutes to travel 8 kilometers.

.

So, the final answer is 48