Question
A was travelling from point X to point Y. He increased
his speed by 16 km/h after every hour. He reached his destination in 18 hours. If his initial speed was 30 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (18/2) × {2 × 30 + (18 – 1) × 16} = 9 × (60 + 272) = 2988 km Required average speed = 2988/18 = 166 km/h
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