Which of the following could represent consecutive even integers?
a. x + 1, x + 2
b. x + 1, x + 3
c. 2x, 2x + 1

Only b. x+1, x+3 as long as x is an odd integer 

a. x+1, x+2, wouldn't be consecutive even integers.     If x is odd (e.g. 1), then 1+1=2 would be even but, 1+2=3 would be odd. 

c. 2x, 2x+1, wouldn't be the answer.  2x will certainly be even but 2x+1 is going to be odd. 

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

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