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Practice mode Time and Distance

By driving at 3/4 of her usual speed, a teacher reaches school 20 minutes late. What is her usual time for the journey?

Correct answer A. 60 minutes

Explanation

At 3/4 speed the time becomes 4/3 of usual, so the extra 1/3 of usual time = 20 minutes. Usual time = 60 minutes.

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