Question

Jorden drives to the store at 30 miles per hour. On her way home she averages only 20 miles per hour. If the total driving time takes half an hour, how far does she live from the store?

Answer 1

Answer:

Rate column: 30, 20.

Distance column: x miles for both.

Step-by-step explanation:

Answer 2

For this case we have the following definition:
 $d = v * t$
 Where,
 d: distance
 v: speed
 t: time
 Clearing the time we have:
 $t = d / v$
 The total driving time takes half an hour:
 $t = d / v1 + d / v2 1.5 = d / 30 + d / 20$
 Clearing d we have:
 $1.5 * 30 * 20 = 20d + 30d 1.5 * 30 * 20 = 50d d = (1.5 * 30 * 20) / (50) d = 18 miles$
 Answer:
 she lives 18 miles far from the store