An old man goes for an evening walk in a park
and covers a distance of 30 meters an 20 seconds. If
he keeps walking at t

1 thought on “An old man goes for an evening walk in a park<br />and covers a distance of 30 meters an 20 seconds. If<br />he keeps walking at t”

1. Answer:

   50 minutes

   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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