Mary wanted to add to her collection of model planes and trains. she wanted to add 5 model planes which cost $19 each and 3 model trains which cost $199 each. which of the following is a good estimate of how much money mary spent?

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step-by-step explanation:

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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