Explanation: \(\text{Solve: } \frac{T_m}{T_e} = \sqrt{\frac{g_c}{g_m}} = \sqrt{\frac{GM_c}{R_c^2} \times \frac{R_m^2}{GM_m}} \) \(\phantom{\text{Solve: }} = \sqrt{\frac{M_c}{R_c^2} \times \frac{10R_c^2}{4M_c}} = \sqrt{\frac{10}{4}} = 1.58\) \(\therefore T_m = 1.58 \times T_e = 1.58 \times 2 = 3.16 \, \text{sec}\) \(\text{Ans. অপশনে নেই}\)