A submarine is located at 250m below sea level. It rises 80m an then dives 120m.
Where is the submarine located now?
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Answer:
Time taken to travel 20 m = 1 min
Time taken to travel 360m =
x
min
therefore:
1
20
=
x
360
(cross multiply)
20
x
=360
(isolate
x
by dividing both sides by 20)
x
=
360
20
x
= 18 mins.
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