A 100 metre race is started by firing a gun. The gun makes a bang and a puff of smoke comes out of the gun as shown.
When does the finishing judge see the smoke and hear the bang?
1 )
sees the smoke:immediately / hears the bang:immediately
sees the smoke:immediately / hears the bang:after about 0.3s
3 )
sees the smoke:after about 0.3s / hears the bang:immediately
4 )
sees the smoke:after about 0.3s / hears the bang:after about 0.3s
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