Homework Help: Math

Posted by Becky on Monday, November 19, 2012 at 7:16pm.

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?

Math - Brenda, Monday, November 19, 2012 at 7:26pm
(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?

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