an old man goes for an evening walk he covers a distance of 20 m in 30 seconds if he keep walking at this rate find the distance covered by him in 5 minutes 10 seconds time
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Explanation:
Time taken to cover 20 km at speed 5 km/hr = 4 hours
∴ Fixed time = 4 hour - 40 minutes = 3 hour 20 min
Time taken to cover 20 km at the speed 8 km/hr = 20/8 = 2 hours 30 minutes
∴ Required time = 3 hours 20 minutes - 2 hr 30 min
=50 minutes
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