Question

A cyclist travel 40 km in 2 hours. Hor far can be walk in 10 hours?​

Answer 1

Answer:

120 km .............

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Answer 2

Answer:

Let the speed of the cyclist be x km/hr ∴

x

40

−

x+2

40

=1⇒

x(x+2)

40(x+2)−40x

=1

⇒80=x

2

+2x⇒x

2

+2x−80=0

⇒x

2

+10x−8x−80=0

⇒x(x+10)−8(x+10)=0

⇒(x−8)(x+10)=0⇒x=8or−10

Neglecting -ve values, we take x = 8 km/hr