Question
Average speed of ‘A’ during a 30-hour journey is 34
km/h. If he covered the first 180 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’ = 30 × 34 = 1020 km Time taken to cover 180 km = 180/20 = 9 hours Time taken to cover remaining distance = 30 – 9 = 21 hours So, required speed = {(1020 – 180)/21} = 40 km/h
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