Question
A was travelling from point X to point Y. He increased
his speed by 20 km/h after every hour. He reached his destination in 14 hours. If his initial speed was 60 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (14/2) × {2 × 60 + (14 – 1) × 20} = 10 × (120 + 260) = 2660 km Required average speed = 2660/14 = 190 km/h
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