A submarine starts moving down in water at the rate 6m per minute after sometimes it reachs a depth of 60m . How will this distance be represented? How much time it will take to reach this level?
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answer:
time taken to travel 20m = 1 min
time taken to travel 360m=x min
therefore:
1/20=x/360(cross multiply)
20x=360
(isolate x by dividing both size by 20)
x=360/20
x=18mins
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