if x varies inversely as y, then

xy = k(constant) …(1)

if x = 60 and y = 10

∴ xy = 60× 10 = 600

⇒ k = 600

When y = 2, then from Eq. (i)

x × 2 = k

⇒ 2x = 600

⇒ x = 300