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:

6 miles

Step-by-step explanation:

Givens

Going to the store

• r = 30 mph
• d = ??
• t =  t

Coming Back

• r = 20 mph
• d = ??
• t = 0.5 - t

Formula

d = r * t

Solution

Since the distance going there and coming back are the same, they can be equated.

30*t = 20*(0.5 - t)

30t = 20*0.5 - 20 t            Add 20 t to both sides. Combine line terms

30t + 20t =  10                    Combine the results of the last step.

50t = 10                              Divide by 50

t = 10/50                          

t = 0.2 hour

So the time taken to go there is 0.2 of an hour.

Distance.

d = r*t

d = 30 * 0.2

d = 6 miles   Answer

Answer 2

My guess ( I am found of thoses words "I guess") 6 miles