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Two wheels, each marked with a dot on it...

Two wheels, each marked with a dot on its rim, are mounted side by side. Initially the dots are alinged and wheels are at rest. One of the wheels is given a constant angular acceleration of `(pi//2) rad//sec^(2)` and the other wheel is given a constant angular acceleration `(pi//4)rad//sec^(2)`. Both acceleration are in the same direction. Find the time (in s) after which the two dots will becomes alingned again for the first time.

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