Time Distance Distance / Time
2hrs 90 miles 90 miles / 2 hrs = 45 miles / hr
3hrs 135 miles 135 miles / 3 hrs = 45 miles / hr
5hrs 225 miles 225 miles / 5 hrs = 45 miles / hr
6hrs 270 miles 270 miles / 6 hrs = 45 miles / hr
Constant of proportionality is 45 miles / hr. This is the same for the four values. The unit rate is also 45 miles / hr.
Let us assume the Distance , d is directly proportional to Time, t
d α t
d = kt
Constant of proportionality is k which is D/T
d = 45t
He moved it at 30ft./minute
Answer:12.33
Step-by-step explanation:
Consider the substitution,
so that the integral is equivalent to
Notice that
which means 
is odd, so
Perhaps more work than necessary, but it does make it easier to see that the original integrand exhibits some symmetry about 
.
