algebra

Hello there can someone plz check these for me I had a little bit of trouble with them.
1. In the calculations shown, what will the units of the final answer be?
18meters/second×3600 seconds/1 hour ×1 mile/1609 meters
A.miles/hour******
B.meters/second
C.miles/second
D.meters/hour
2.Which of the following is the correct conversion rate to change feet per second to yards per second?
A.1 ft/3 yard
B.1 yard/3 ft
C.3 yard/1 ft
D.3 ft/1 yard*****
3. Which of the following is the correct conversion rate to multiply by in order to convert from meters per second to centimeters per second?
A.100 cm/1 s
B.100 m/1 cm
C.100 cm/1 m*****
D.100 s/1 m
I had 2 guesses for each question because I wasn't sure but thank you so much!

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  1. #2 and #3 are similar problems

    take another look at #2

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  2. my other guess for number 2 and 3 were 2. a and 3. b

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