Please tell how to solve Q 3

D e a r S t u d e n t, T h e a i r p r e s s u r e f a l l s b y 10 m m o f H g f o r 120 m o f a s c e n t . i e; A t m o s p h e r i c p r e s s u r e d e c r e a s e s l i n e a r l y w i t h a s c e n t . I n c r e a s e i n a l t i t u d e f o r 1 c m o f H g i s, h = \frac{120 m}{10 m m} = \frac{120 m}{1 c m} = 120 m p e r c m o f H g D e c r e a s e i n b a r o m e t e r r e a d i n g = 76 - 70 = 6 c m H g D i s \tan c e c o v e r e d (h e i g h t o f t h e h i l l) f o r 6 c m H g i s, H = h \times 6 = 120 \times 6 = 720 m R e g a r d s .

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