Elisabeti bikes from home to the grocery store and back to pick up in- gredients. On the way to the store, she averages 15 mph. Encumbered by groceries, she averages 10 mph on the way back. What is her average speed for the whole hour?
4 answers
Here average speed is 12.5 mph.
Her*
AxenMO, if you cannot explain how to do the problem, you have not helped this student. Just giving the answer is very unhelpful.
distance home to store = d
total time = 1 hr
d = 15 t
d = 10(1-t)
15 t = 10 -10 t
25 t = 10
t = 10/25
d = 15* 10/25
d = 6 miles each waay
total distance = 12 miles
total time = 1 hour
so average speed = 12 miles per hour
BY THE way AXENMO averaging the speeds them selves is NOT correct.
total time = 1 hr
d = 15 t
d = 10(1-t)
15 t = 10 -10 t
25 t = 10
t = 10/25
d = 15* 10/25
d = 6 miles each waay
total distance = 12 miles
total time = 1 hour
so average speed = 12 miles per hour
BY THE way AXENMO averaging the speeds them selves is NOT correct.
1 answer