One person travels at a distance of 18 km at a speed of 9 km / h. If he rests for 5 minutes every 1 km, how long will it take him to go the whole way?
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50 minutes
Time taken in covering 5 km = \frac{5}{10} = \frac{1}{2}\ hour = 30\ minutes
That person will take rest for four times.
∴ Required time = (30 + 4 \times 5) minutes = 50 minutes.
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