Kathy can swim 45 meters in 30 seconds. At that rate, how far can she swim in 90 seconds?

135

Step-by-step explanation:

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.

~

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m