Walking at $$\frac{7}{9}$$ of his usual speed, a person reaches his office 10 minutes later than the usual time. His usual time in minutes is:
If the person is walking on 7/9 th of his usual speed , he is taking 9/7 th of his usual time.Let the usual time be x.
So , extra time = 2/7th of usual time
$$\frac{2}{7} \times x = 10$$=> x= 35 minutes
So, the answer would be option a)35 minutes.
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