Question
Average speed of ‘A’ during a 20-hour journey is 24
km/h. If he covered the first 320 km of his journey at a speed of 20 km/h, then find the speed at which ‘A’ travelled during the remaining journey.Solution
Total distance covered by ‘A’ = 20 × 24 = 480 km Time taken to cover 320 km = 320/20 = 16 hours Time taken to cover remaining distance = 20 – 16 = 4 hours So, required speed = {(480 – 320)/4} = 40 km/h
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