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On average, the bottle-nosed dolphin comes up for air once every two minutes; the beluga whale, close relative, comes up for air on average once every five minutes. The number of times a bottle-dolphin would come up for air in a 24 hour period is approximately what percent greater than number of times a beluga whale would come up for air in that same period?

Created: 1 year ago | Updated: 1 year ago
Updated: 1 year ago

The first pump can drain in 3 hours 12 of the pond

The first pump can drain in 1 hours=12×3=16 of the pond

Both pumps can drain in 112or32 hours=1-12=12 of the pond.

Both pumps can drain in 1 hours =12×13=13 of the pond.

Working alone the second pump can drain in 1 hour =13-16=2-16=16 part of the pond

The second pumps can empty 16 of the pond in 1 hour

The second pump can empty 1 or full pond n = 6 × 11 = 6 hours.

1 year ago

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