Answer:
f(x) = y
y = 7.50x
To find the inverse, swap x and y
x = 7.50y
Now solve for y
y = x/7.50
f-1(x) = x/7.50
You are taking two times a number, which is defined as x. That is equivalent to 2x. Then, you are adding three more to that product.
For this case, the first thing we must take into account is the following definition:
d = v * t
Where,
d: distance
v: speed
t: time
Substituting values we have:
Trip 1:
50 = v * t1
We cleared t1:
t2 = (50) * (1 / v)
Trip 2:
300 = (3 * v) * t2
We cleared t2:
t2 = (300/3) * (1 / v)
t2 = (100) * (1 / v)
Rewriting:
t2 = 2 (50) * (1 / v)
t2 = 2 * t1
Answer:
His new time compared with the old time was:
Twice the old time.
t2 = 2 * t1.
