Which expression below is a counterexample to the following statement?
if a number is divisible by 3, then it is divisible by 6.
a. 42 is divisible by 3, so it is divisible by 6.
b. 15 is divisible by 3, but is not divisible by 6.
c. 18 is divisible by 6, so it is divisible by 3.
d. 6 is divisible by 2 and 3, so it is divisible by 6.

B.15 is divisible by 3, but is not divisible by 6.

Step-by-step explanation:

We are given that a statement

If a number is divisible by 3 , then it is divisible by 6.

We have to find that which expression is a counterexample to the given statement.

If a number is divisible by 3 then it is not necessary the number is divisible by 6.

Therefore, given statement is false.

Example:a number is 15.

It is divisible by 3 but, it is not divisible by 6.

Hence, option B is true.

B.15 is divisible by 3, but is not divisible by 6.

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