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Helen runs a 30-mile course at a constant rate of 4 miles per hour. If Chinu runs the same track at a constant rate and completes the course in 90 fewer minutes, how fast did Chinu run?

A. 6 miles per hour

B. 5 miles per hour

C. 5.75 miles per hour

D. 7.5 miles per hour

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সঠিক উত্তরঃ A. 6 miles per hour

Explanation:

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Helen runs a 30-mile course at a constant rate of 4 miles per hour. If Chinu runs the same track at a constant rate and completes the course in 90 fewer minutes, how fast did Chinu run?