Question

A quantity, t, varies inversely with a quantity, r. If t = 6, then r = 5.

What is the constant of variation?

Answer 1

k = 30

rt = 30

What is the value of t when r = 15? = 2

Answer 2

t = k/r where k is the constant of variation
substituting:-

6 = k / 5

multiplying both sides by 5:
30 = k

canstant of variation = 30