Let the distance to be travelled be ‘x’ km Time taken when speed is 20 km/hr = (x/20) hours Time taken when speed is 60 km/hr = (x/60) hours According to the question, (x/20) – (x/60) = 2 Or, 3x – x = 2 × 60 Or, 2x = 120 km Or, x = 60 km Time taken to travel 60 km with speed of 20 km/hr = 60/20 = 3 hours Therefore, he started at 12 – 3 = 9 a.m. Therefore, required speed to reach the destination at 11 a.m. or 2 hours = 60/2 = 30 km/hr
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