Robert is scuba diving off the coast of australia. when he is ready to come back to the surface, he rises 36 meters at a safe speed. he climbs 30 centimeters every second. how many seconds will it take him to reach the surface?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

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step-by-step explanation: