SOLUTION: It takes Mary 30 minuites to walk uphill 1 Km from her home to school, but it takes her only 10 minuites to walk from school to home along the same route. What is her average speed
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Question 183983: It takes Mary 30 minuites to walk uphill 1 Km from her home to school, but it takes her only 10 minuites to walk from school to home along the same route. What is her average speed, in Km/hr, for the round trip? Found 2 solutions by stanbon, ankor@dixie-net.com:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! It takes Mary 30 minuites to walk uphill 1 Km from her home to school, but it takes her only 10 minuites to walk from school to home along the same route. What is her average speed, in Km/hr, for the round trip?
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rate = distance / time
rate = (1km + 1km) /((1/2) hr + (1/6)hr)
= 2km/(8/12) hr
= 2km/(2/3) hr
= 3 km/hr
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Cheers,
Stan H.
You can put this solution on YOUR website! It takes Mary 30 minutes to walk uphill 1 Km from her home to school, but it
takes her only 10 minutes to walk from school to home along the same route.
What is her average speed, in Km/hr, for the round trip?
:
Round trip dist = 2 km
:
Change the times to hrs:
30/60 = hr
10/60 = hr
:
Total time = hr
:
Speed =
When dividing, invert the dividing fraction and multiply:
2 * = = 3 km/h is the average speed
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