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Rate problems 2

Starting at home, Nadia traveled uphill to the grocery store for 3030 minutes at just 44 mph. She then traveled back home along the same path downhill at a speed of 1212 mph.
What is her average speed for the entire trip from home to the grocery store and back?
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
mph