A person starting from his house covers a distance at 20 km/hr and returns to the starting place at 30 km/hr. His average speed during whole journey is
25 km/hr
24 km/hr
20 km/hr
22 km/hr
27 km/hr
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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