Expression for time in terms of G (universal gravitational constant), h (Planck constant) and c (speed of light) is proportional to :

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$\sqrt{\frac{Gh}{c^{3}}}$

$\sqrt{\frac{c^{3}}{Gh}}$

$\sqrt{\frac{{hc}^{5}}{G}}$

$\sqrt{\frac{Gh}{c^{5}}}$

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t = G^a h^b c^c

⇒ M^oL^oT’ = (M^–1 L³ T^–2)^a (ML²T^–1)b (LT^–1)^c

⇒ –a + b = 0 ⇒ a = b

⇒ 3a + 2b + c = 0

⇒ c = –5a

⇒ –2a – b – c = 1

$\Rightarrow a = \frac{1}{2}; b = \frac{1}{2}; c = - \frac{5}{2}$