(A) 1 to 4 m/sec
(B) 5 to 8 m/sec
(C) 9 to 12 m/sec
(D) More than 12 m/sec
(A) 1 to 4 m/sec
(B) 5 to 8 m/sec
(C) 9 to 12 m/sec
(D) More than 12 m/sec
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