A was travelling from point X to point Y. He increased his speed by 10 km/h after every hour. He reached his destination in 14 hours. If his initial speed was 30 km/h, then what was his average speed in the whole journey?
Total distance travelled by A = (14/2) × {2 × 30 + (14 – 1) × 10} = 7 × (60 + 130) = 1330 km Required average speed = 1330/14 = 95 km/h
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