Two balls are projected simultaneously with the same speed from the top of a tower, one vertical...

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Two balls are projected simultaneously with the same speed from the top of a tower, one vertically upwards and the other vertically downwards. They reach the ground in \( 9 s \) and \( 4 s \), respectively. The height of the tower is \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(a) \( 90 \mathrm{~m} \)
(b) \( 180 \mathrm{~m} \)
(c) \( 270 \mathrm{~m} \)
(d) \( 360 \mathrm{~m} \)
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