Two particles \( A \) and \( \mathrm{B} \) projected along different directions from the same po...

Two particles \( A \) and \( \mathrm{B} \) projected along different directions from the same point \( P \) on the ground with the same velocity of \( 70 \mathrm{~m} / \mathrm{s} \) in the same vertical plane. They hit the ground at the same point \( Q \) such that \( P Q=480 \mathrm{~m} \). Then \( \left[\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^{2}\right] \)
(A) Ratio of their times of flight is \( 4: 5 \)
(B*) Ratio of their maximum heights is \( 9: 16 \)
(C*) Ratio of their minimum speeds during flights is \( 4: 3 \)
(D*) The bisector of the angle between their directions of projection makes \( 45^{\circ} \) with horizontal