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A sound wave from a ship received 8.4s later ,what is the depth of the...

A sound wave from a ship received 8.4s later ,what is the depth of the sea ( speed of sound is 2500m/s)
A 0.179km
B 0.357km
C 3.150km
D 6.300km
E 12.600km
Please what is the answer the only thing that is confusing is the fact that we have to convert it to km which is quite confusing?

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709