39/1.5 = 26 km per hour
51/3 = 17 km per hour
Then you need the mean. 26+17/2 = 21.5 km per hour
Answer:
The correct option should have been
.
Step-by-step explanation:
Given the expression

solving the expression

Remove parentheses: (a) = a

Group like terms

Add similar elements

It is clear that not a single given option is
. It means no option is correct. It seems you mistyped the correct options.
The correct option should have been
.
Answer:
no
Step-by-step explanation:
80-225*1/3=80-75=5