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A horn is sounded at regular intervals in front of a high wall 1320m away.If...

A horn is sounded at regular intervals in front of a high wall 1320m away.If the echo from the wall is heard simultaneously with the next hoot,how many hoots are made every two minutes?(speed of sound in air is 330m/s?
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Asked by Promise of God on 9th June, 2014
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