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If a train runs at 70 km/hour, it reaches its destination late by 12 minutes. But if it runs at 80 km/hour, it is late by 3 minutes. The correct time to cover the journey is

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Detailed Solution

Let correct time to cover journey be t hours

$\begin{array}{l} 70 (t + \frac{12}{60}) = 80 (t + \frac{3}{60}) \\ 70 t + 14 = 80 t + 4 \\ 10 t = 10 \\ t = 1 hour \end{array}$

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