Question

Daily go from home to school driving my car the school is 15 miles (d) from my house. The speed limit is 30 miles per hour. I have to be at school not after 08:00 am (t1). Repersents the time leave home, where the limit is defined by d=s(t1-t0 What time should I leave home?

Answer 1

7:30 a.m

Explanation:

Number of miles from house to school(d) = 15 miles

Speed limit (s) = 30 mph

t1 = time to be in school is at most 8:00a.m

t0 = time to leave house

Given the model. :

15 = 30(8 - t2)

15 = 240 - 30t2

30t2 = 240 - 15

30t2 = 225

Divide through by 30

30t2 / 30 = 225/30

t2 = 7.5

Hence, I need to leave home by 7.5 (.5 in minutes = 0. 5*60 = 30 minutes)

Hence, t0 = 7:30,; I need to leave home by 7:30 a.m