SOLUTION: Hi I'm not to sure how to begin solving this problem. Andrea makes a trip by car at an average speed of 60mph. She returns by the same route at an average speed of 50mph.

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Question 438769: Hi
I'm not to sure how to begin solving this problem.
Andrea makes a trip by car at an average speed of 60mph. She returns by the same route at an average speed of 50mph.
Calculate her average speed for the entire return journey. (5 marks)
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
let d = one-way distance.
Then average speed = %282d%29%2F%28d%2F60+%2B+d%2F50%29+=+2%2F%281%2F60+%2B+1%2F50%29+=+600%2F11+=+54%266%2F11 miles per hour.