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enthada | 13:53 Tue 30th May 2006 | Quizzes & Puzzles
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A person walking 5/6 of his usual rate is 40 minutes late. What is his usual time?.
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3 hours 20 minutes

200 minutes


eg.


normally travels at 6mph - travels 20 miles


at 5mph, 20 miles takes 4hrs = 240mins

Method:Walking at rate R, taking T minutes to cover distance D then D = RT.


Walking at rate 5R/6, we have 5R(T + 40)/6 = D


So (cancelling Rs) 5(T + 40)/6 = T


T + 40 = 6T/5


5x40 = T ( 3hours 20 mins)

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