Answer:
135 meters/90 seconds
Step-by-step explanation:
Kathy swims 45 meters in 30 seconds. Divide 90 with 30:
90 seconds/30 seconds = 3 seconds/1 seconds.
Multiply 45 meters with 3 to get the amount she swam in 90 seconds:
45 x 3 = 135
135 meters is your answer.
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