Moving at $140 %$ more than his usual speed, Ravi reaches his office $6$ min early. Time taken with usual speed is

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Solution

New speed $= 140 %$ of the usual speed

$= \frac{7}{5}$ of the usual speed

$T i m e \propto \frac{1}{S p e e d}$

New time = $\frac{5}{7}$ of usual time

Time saved = $1 - \frac{5}{7} = \frac{2}{7}$ of usual time

Time taken with usual speed = $\frac{6 \times 7}{2} = 21 m i n$

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