SOLUTION: A girl travels from home down a 3km street at a speed of 4km/h. She travels quicker returning home, with her round-trip time being 1 hour and 15 minutes. What was her speed returni

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Question 882663: A girl travels from home down a 3km street at a speed of 4km/h. She travels quicker returning home, with her round-trip time being 1 hour and 15 minutes. What was her speed returning home?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Her time going from home down the street is:
+t+=+3%2F4+ hr
The round-trip time is :
+1+%2B+1%2F4+=+5%2F4+ hr
-------------------------
So, her time returning home is:
+5%2F4+-+3%2F4+=+1%2F2+ hr
----------------------------
Returning home:
+3+=+s%2A%281%2F2%29+
+s+=+3%2F%281%2F2%29+
+s+=+6+
Her speed returning home is 6 km/hr