A man covers a distance by $\dfrac {3}{4}$ of its speed and late by $30$ min. If he walks by increasing $40 \%$ of real speed. How much time before he reached ?
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A man covers a distance by $\dfrac {3}{4}$ of its speed and late by $30$ min. If he walks by increasing $40 \%$ of real speed. How much time before he reached ?