Miles per hour is the conversion to use, the answer is 4 miles per hour if that is needed.
= 
Step 1: Cancel 4/6 and change to 2/3.

Step 2: Adjust Fractions based on the LCM.
The LCM of 3 , 9 : 9


Step 3: Subtract the numbers : - 6 -7 = -13

Answer:
c
Step-by-step explanation:
because it is 3x10 to the 5th power there woould be 5 zeros
Work shown above! Hope ya understand!