Multiply 2/3 by 84 which is 56.
T = k/R where k is the constant of variation, T=time and R=speed.
Plug in the given values:-
12 = k/60
k = 12*60 = 720
So the equation of variation is T = 720/R
At 85 mph we have
T = 720 / 85 = 8.47 hours (answer)
M+k because the subtraction sign and negative cancel out to become positive
Answer:
the answer is C
Step-by-step explanation: