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Today's question of the day is from the algebra category. Click on an answer choice and then click on 'submit answer' to see if you got it right!

Driving at a constant pace, it usually takes Sally one hour to drive the 40 miles to work. Today she has driven at half her usual average speed for the first 30 minutes of her trip. What speed must she average for the rest of her trip in order for the total trip to take her one hour?

  Answer A   20 miles per hour
Answer B 30 miles per hour
Answer C 40 miles per hour
Answer D 60 miles per hour
Answer E she cannot make it in time

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