A cycleist travels 100m in 2second . what is his speed in KM/h?
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100m = (100 × 1/1000) km = 1/10km
2sec = (2 ×1/3600) hours = 1/1800 hours
speed = distance/time
speed = 1/10 ÷ 1/1800
speed = 1/10 × 1800
speed = 180km/hour
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