Please solve the Q18 , 20 and 21

Please solve the Q18 , 20 and 21 by hmng 01 Explain with 1650 m

Dear Student,
                        20.      Speed =distance time =11203.3=340m/s
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speed of wind makes the sound travelling speed depend on it . therefore if the speed of wind is fast then the speed of sound will be fast and vice-versa
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