Q.

A 1.5 m tall man walks at a uniform speed of 60 m/min away from a lamp post of height 6 m. Find the rate at which his shadow increases

A. \(\frac\)

B. \(\frac\)

C. \(\frac\)

D. \(\frac\)

E. \(\frac\)

D. \(\frac\)

\(\Rightarrow\) \(\frac\) = \(\frac\) = \(\frac\)

= a + b = 4b

= a = 3b

\(\Rightarrow\) Time to travel dist "a" = \(\frac\)min

\(\frac\)min  \(\rightarrow\) b

1 min \(\rightarrow\)  ?

= \(\frac\)

= 20 m/ min