A Badly Designed Clock

Geometry Level 5

A badly designed analogue clock has its hour hand and minute hand the same length. How many times in a day will one not be able to tell what time it is from looking at the clock? Assume that you can distinguish between AM and PM.

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A Badly Designed Clock

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100 Day Summer Challenge

A Badly Designed Clock

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.