A car travels first 1/3 of distance AB at 30 km/hr , next 1/3 of distance at 40 km/hr , last 1/3 of distance at 24 km/hr . It's average speed in km/hr for whole journey is-
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= 3×30×40×24/40×30+40×24+24×30
=86400/2880
=30.8571
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