A submarine can descend from the water surface at the rate of 12 m per
minute. After descending for 20 minutes, it again rises by 30 metres. What
is its new position?
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Step-by-step explanation:
Answer is 12 m per minute = 12 ×20 = 240
= 240 - 30 = 210 m
Its new position is 210 m below water surface
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