Ella walked 4.5 km/h to her friends house. She walked back home from her friends house at 3.5 km/h. She walked a total of 40 minutes. How many minutes was her walk on her way to her friends house?

(4.5 km/hr x X) + (3.5 km/hr x Y) = 40

Where X is the time there and Y is your time back.

X = (40 - 3.5 Y) / 4.5
= 8.88 - 0.77Y

Now plug X back into your original eqn and solve for Y:

4.5 (8.88 - 0.77Y) + 3.5Y = 40

Got it?

To solve this problem, we can use the formula:

Distance = Speed x Time

Let's assume t is the time (in minutes) that Ella took to walk to her friend's house.

From the given information:

Distance from Ella's house to her friend's house = Distance from her friend's house to Ella's house = t * 4.5 km/h

Distance from Ella's house to her friend's house + Distance from her friend's house to Ella's house = total distance = 40 minutes

So, we can write the equation:

t * 4.5 km/h + t * 3.5 km/h = 40 minutes

Now, let's solve the equation to find t:

t * (4.5 km/h + 3.5 km/h) = 40 minutes

t * 8 km/h = 40 minutes

Dividing both sides of the equation by 8 km/h:

t = 40 minutes / 8 km/h

t = 5 minutes

Therefore, Ella took 5 minutes to walk to her friend's house.