Question

7. A boy starts from a point A, travels to a point B at a distance of 3 km from 1 A and returns to A. If he takes two hours to do so, his speed is O(a) 3 km/h O (b) (b) zero O (C) 2 km/h 0 (d) 1.5 km/h​

Answer 1

Answer:

➪Solution☟︎︎︎

➪2S=x+y+z⇒4S−x=3s−y=2S−z=λ

➪S−x=4λ

➪S−y=3λ

➪S−z=2λ

____________

➪S=9λ

➪Adding all, we get

Adding all, we getS=9λ,x=5λ,y=6λ,=z=7λ

➪πr2=38π⇒r2= \ \frac{8}{3} πr2=38π⇒r2=

3

8

➪πr2=38π⇒r2=38

➪Δ=S(S−x)(S−y)(S−z)

⇒Δ=9λ.4λ.3λ.2λ=66λ2

➪R=4Δxyz=4.66λ25λ.6λ.7λ=4635λ

➪we get λ=1